When to use “on” and when to use “in”

Nate asks: What are the proper usages of the words “in” and “on” in a sentence? I often confuse the two. Here are some examples: “The boat is in/on the water,” “We are in/on the planet,” “We’re going to the concert in/on July 1st.”

The use of prepositions in English is frequently idiomatic. General guidelines exist, but be prepared to learn individual expressions in which the preposition does not adhere to the guidelines.

In the case of the prepositions in and on, here are the most usual uses.

In

in mainly denotes “rest at”:

PLACE: He lives in the country. He lives in Chicago. (BUT, He lives at 2300 Wabash Ave.)
TIME: I’ll be there in an hour.
MANNER: The child ran down the steps in tears.
REFERENCE: In my opinion we need a referendum. They are happy in their marriage.

On

on indicates proximity and position above or outside:

PLACE: He sat on the fence.
TIME: He was not thinking well on that occasion.
REFERENCE: He asked my opinion on the matter.
CONDITION: We’ll hire him on your recommendation.

The examples given in the question:

We are on the planet.
We are going to the concert on July 1.

But

We are going to the concert in July.

As for the example about the boat, either is correct, according to what is meant:

The boat is in the water. (As opposed to being on dry land for the winter)
The boat is on the water. (Look at all those boats out there on the water!)

However, it would be unidiomatic to say The ship is in the ocean or in the sea, unless you mean that it has sunk. The ship is on the sea.

Related to the question of when to use in is that of when to use into. While in denotes the state of being “at rest” in a place, or at least being (in a sense) surrounded by something, into denotes motion towards:

The dog jumped into the water.
The children (who were already in the water) jumped in the water.

When deciding whether to use in or into, ask yourself if the person or thing you are talking about is moving from one place to another. If so, use into.

More about prepositions in later posts. Stay tuned!

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68 Responses to “When to use “on” and when to use “in””

  1. Ramkarthik on July 1, 2007 4:38 pm

    Very good and clear explanation. I never pick up the difference between these words. Now I think I have got it almost. I wish I knew it before itself. At least I would have got 5 more marks in the English Grammar Exercise. Thanks for the post Maeve.

  2. Dj Flush on July 1, 2007 4:40 pm

    Honestly Daniel that was one great tip. I myself face the problem of deciding where to use on and where to use in but this post summed it up quite well.

    Thanks a lot

  3. temp on July 1, 2007 4:54 pm

    I don’t really get the in/on part for TIME, I must use in if im refeering to a specific time, or for the rest of cases, right?

  4. Maeve on July 1, 2007 6:41 pm

    I’m not sure what “temp” is asking. Perhaps a few more TIME expressions will help:
    in a minute
    in twenty minutes
    in two shakes of a lamb’s tail
    in a flash
    on the Fourth of July
    on my birthday
    It may be necessary to memorize the more common usages. As I mentioned in the post, prepositional usage is often idiomatic and difficult to pin down.

  5. Sally on July 1, 2007 7:40 pm

    I don’t think I’ve ever been told what a prepositions is. At least I don’t remember.

    Please explain Preposition. Sorry I’m lost at paragraph 2.

  6. Daniel on July 1, 2007 7:50 pm

    Sally, prepositions are words that connect nouns and explain their relationship with other words. Here are some examples:

    with
    at
    by
    to
    in
    for
    from
    of
    on

  7. Charles on July 1, 2007 10:33 pm

    On an email listserv, someone asked, why do we say:

    “In the Army but on a soccer team
    In a political party but on a staff”

    Any suggestions?

  8. Daniel on July 1, 2007 11:57 pm

    “The use of prepositions in English is frequently idiomatic. General guidelines exist, but be prepared to learn individual expressions in which the preposition does not adhere to the guidelines.”

    I am sure if there are any explanations for the cases you mentioned in particular.

  9. Jay Wagers on July 2, 2007 3:05 am

    Prepositions are simple if you understand that they only function to show relationships. Here is how I explain them to my students (college freshmen and sophmores).

    I grab a chair and position myself:

    I can be beside the chair, behind the chair, by the chair, and beyond the chair.

    I can be in front of the chair, in the chair, and on the chair.

    If I have some weird obsession, I could be into the chair.

    I can be under the chair and, if somehow melted together and remade, of the chair.

    If the chair is one if my parents, I am from the chair. However, I could move away from the chair.

    I could walk to the chair. I could stare at the chair. I could move towards the chair.

    I could walk around the chair. I could be above the chair. I could feel certain feelings about the chair.

    I could make many more examples. However, that’s not the point.

    Regarding the question, the word in denotes that the noun is consumed by the object of the preposition . The word on denotes that the noun is above or atop.

  10. francesco mapelli on July 2, 2007 9:50 am

    I still don’t get the

    He was not thinking well on that occasion.

    why is “in” wrong here?

  11. Zach Everson on July 2, 2007 12:46 pm

    Great timing–I just heard a clip of Joe Biden on NPR in which he used “on” when he meant “in.”

  12. Amy W. on July 9, 2007 6:06 pm

    I’ve never personally experienced any confusion about On and In, but a friend of mine makes me laugh with her usage, which I suspect is dialectic. If she is seated indoors without benefit of chair or other support, she claims to be sitting “in” the floor.

    It always triggers a joke from my husband about a man who is instructed to “Get on the plane.” The man’s response: “Forget that–you get on the plane! I’m getting in the plane.”

  13. Roswell Ward on September 7, 2007 5:44 am

    Is it “We participated in a field trip.” or “We participated on a field trip.”?

  14. Maeve on September 7, 2007 12:44 pm

    Roswell,
    “participated in a field trip”
    But you’d “go on a field trip.”

  15. Chess on October 18, 2007 8:18 pm

    What about these:
    “We will go to the beach on Monday” or “We will go to the beach Monday”?
    “Monday mom baked a pie” or “On Monday mom baked a pie”?

  16. Katty on October 20, 2007 2:13 am

    Is it: “his picture was on the paper” or “his picture was in the paper”

  17. Maeve on October 20, 2007 3:06 am

    His picture was in the paper. (if the picture was printed in the paper.)

    If a photo just happened to be lying around, it might end up “on the paper”!

  18. Annette on December 20, 2007 1:50 pm

    When did the rule about ending the sentence with a preposition change? It’s always been one of my pet peeves (in written word more than spoken) because we learned it was wrong in high school grammar…. but now I’m reading that it’s acceptable?

  19. Maeve on December 20, 2007 2:11 pm

    Annette,
    Your question deserves a post of its own. Stay tuned.

  20. Fabgrandma on January 27, 2008 2:29 am

    My question is about using into and in to. When you are talking about someone who has committed a crime, do they turn themselves “into” the police, or in to the police? Is there a difference? The first one always makes me think of the person as a magician.

  21. Maeve on January 27, 2008 2:26 pm

    Fabgrandma,
    The wanted persons would turn themselves in to the police.

    They would jump into the water.

    See my article on http://www.dailywritingtips.com/me-myself-and-i/

  22. Carlos K on February 25, 2008 6:07 pm

    Hello. I understand the correct forms are “in May” and “on May 3rd”, but I can not decide between “In December 2007” and “On December 2007”.

  23. Maeve on February 25, 2008 10:15 pm

    Carlos,
    You would use “on” only if the day as well as the month is specificed:

    Ex.
    I visited Paris in December 2007.

    On December 3 (or “on December 3, 2007″), I went to the top of the Eiffel Tower.

  24. Carlos K on February 26, 2008 4:16 pm

    Thank you very much… I’ll follow that tip.

  25. Ram on May 1, 2008 4:37 pm

    My daughter will be going to college in two years from now. Is this grammatically correct. Or the sentence should be without ” in”

  26. yoni on June 15, 2008 8:57 am

    Hi there! I too struggle a lot on how to use “on” and “in” in a sentence,don’t know if “in a sentence is correct”,does it?. Until now I’m still confuse, but at least I know now that it is idiomatic and there is a general guidelines exist on using them.. By the way does anyone knows how to use has, had, and have? I know their meanings but sometimes I just don’t know when to use them, like for example; I have done that or I had done that, I know that “had done that means I already did it, but what about “have done”?Like most of the time people uses “have”even though I think “had” is more appropriate to use beacause they are talking about the past. I hope you guys can contribute facts and ideas towards my inquiries. Like everyone else I like to uprgrade my grammar. Thanks.

  27. migs on June 20, 2008 6:41 am

    how about this: “The motivation for this lies IN the need” or is it “The motivation for this lies ON the need”? (I just capitalized IN and ON to stress my point)

  28. toto on July 30, 2008 6:04 pm

    “The wanted persons would turn themselves in to the police.”

    I understand how people get confused as to when to use “into” and “in” here. There shouldn’t be any confusion once you know the verb is “turn in”, not “turn into”? Correct me if I’m wrong.

    They turned themselves in. To whom? To the police. English as a second language here so I could be wrong.

    I too get laughed at at the incorrect usage of “in” and “on”. Even after reading the explanations above, I don’t get them as they don’t make sense all the time for me. Spanish as a first language here.

  29. Jm on July 30, 2008 6:58 pm

    Yoni, here is my try. Not a grammar guru though.

    Have = present
    Had = past

    Done = past participle

    1. Hey Mark, have you done what I asked you to do?

    1. Yes Louis, I have done what asked me to do.

    2. Hey Mark, you told me you had (THEN) done what I asked you to do!

    2. Yes silly, I had told you yesterday that I had (THEN) done what you asked me to do. What’s wrong with you man! :)

    If you are a Spanish speaker,

    Have = he, has, ha, han, hemos (yo he hecho, conjuga el resto)
    Had = habia, habias, habiamos, habian (yo habia hecho, conjuga el resto)

    Anything I’m getting wrong please let me know.

  30. Maeve on July 31, 2008 12:48 pm

    Ram,
    My daughter will be going to college in two years from now.

    You can get away with the “in.” I would omit it and say My daughter will be going to college two years from now.

  31. Maeve on July 31, 2008 12:54 pm

    Yoni,
    You asked for help, so I’m going to point out more than one thing here.
    1. “in a sentence” is correct.
    2. I don’t know if “in a sentence” is correct, does it? should be I don’t know if “in a sentence” is correct, is it?
    3. I’m still confuse. (the “ed” is necessary I’m still confused.)
    4. “have” and “had”: the use of these helping verbs to form past tenses is explained: here. The main thing to remember is that “had done” describes an action that took place before some other action in the past. Ex. I had dropped the crate before I heard the warning.

  32. Maeve on July 31, 2008 12:54 pm

    Toto,
    Good tip. “turn in” is one of those verb phrases so common in English.

    If one said “The criminal turned himself into the police,” the meaning would be that the crimnal was a shape shifter!

  33. Maeve on July 31, 2008 12:55 pm

    Migs
    “The motivation for this lies IN the need.”

  34. Maeve on July 31, 2008 12:57 pm

    Jm,
    I have only two comments on your otherwise excellent examples.

    1. Yes Louis, I have done what asked me to do. — I have done what you asked me to do. (just a typo, I expect.)

    2. Yes silly, I had told you yesterday that I had (THEN) done what you asked me to do. — The “had” is not necessary in the first clause: “I told you yesterday that I had done what you asked me to do.”

  35. Zan on October 15, 2008 3:24 pm

    use in with bodies of water, use on with surfaces.

  36. jm on October 17, 2008 5:20 am

    Thank you for correcting me Maeve.

  37. jm on October 17, 2008 5:23 am

    I typed a message “in” his website or “on” his website?

  38. lavanya on October 17, 2008 12:16 pm

    Hi..

    am still confused abt IN & ON..

    I wrote a test on Arrays. or
    I wrote a test in Arrays.

    Here Arrays is a topic of the subject.

  39. Maeve on October 18, 2008 12:34 pm

    lavanya,
    I wrote a test on Arrays. or
    I wrote a test in Arrays.

    Two things-
    In English we say “I took a test.” “I wrote a paper.”
    The test was on Arrays. I wrote a paper on Arrays.
    I took a course in Arrays.

    What the heck is “Arrays”?

  40. R. V. on October 20, 2008 1:28 am

    Please tell me if you say:

    I have a stain on my shirt or I have a stain in my shirt.
    My daughter’s teacher corrected the sentence by putting “in” instead of “on”. I still think it’s “on”.

  41. R. V. on October 20, 2008 1:29 am

    Please tell me if you say:

    I have a stain on my shirt or I have a stain in my shirt.
    My daughter’s teacher corrected the sentence by putting “in” instead of “on”. I still think it’s “on”.

  42. Maeve on October 20, 2008 12:44 pm

    R.V.
    You’re correct. The idiom is “I have a stain on my shirt.”

    Is the teacher an American speaker?

  43. Jim on October 20, 2008 5:28 pm

    Just checking but I’m correct when I say the following, right?

    Nowadays, you’ll find thinner and lighter notebooks available ON the market.

    This morning, I went downtown and couldn’t find any fresh bass AT the market. [When would you say IN the market?]

    The bank carries heavier losses on its books than we thought.

    In his book, the author writes about his troubled childhood.

    All the material needed to study for the test can be found in this textbook.

  44. Maeve on October 20, 2008 6:56 pm

    Jim,
    You could say “I’m in the market for a new car,” i.e., you are considering a purchase.

  45. R. V. on October 21, 2008 1:11 am

    Maeve:

    What is your background? Are you an English teacher by any chance? Thanks for the tip. BTW, the teacher is not an american teacher.

  46. R. V. on October 21, 2008 1:16 am

    BTW, the sentence that my daughter wrote was actually:

    “The stain on my shirt won’t come off”. Would it still be correct to write it that way or to write it this way: “The stain in my shirt won’t come off” ?

  47. Maeve on October 21, 2008 12:21 pm

    R.V.
    You’ve got it! English teacher to the core. I’ve taught at every level from beginning reading to university. One of my undergraduate English degrees is from the University of London and I have a Ph.D. in comparative literature. Currently I channel my need to teach into DWT and my own site http://www.AmericanEnglishDoctor.com/ Please drop in.

  48. Maeve on October 21, 2008 12:29 pm

    R.V.
    RE: “The stain on my shirt won’t come off”

    In this case it would be possible to say that the stain is IN the shirt, BUT then it would be necessary to say

    “The stain in my shirt won’t come out.”

  49. Jim on October 21, 2008 7:34 pm

    Maeve,

    Thanks for answering. Are the rest of the sentences that I wrote correct? What about the following:

    Financial derivatives are becoming more widely used IN the stock market these days.

  50. Maeve on October 21, 2008 8:10 pm

    Jim,
    The sentences in your earlier post are correct.

    “Financial derivatives are becoming more widely used IN the stock market these days.” Yes, this use of “in” is also correct.

  51. Mike on December 2, 2008 4:51 am

    What is correct?

    “If you need me, I am in the back or I am at the back?”

    “If you need me, I am in the back of the garbage bin or I am at the back of the garbage bin?”

    “If you need me, I will be in the back or I will be at the back?”

    Thank you.

  52. CJ on April 13, 2009 4:44 pm

    REFERENCE: He asked my opinion on the matter.

    IMHO, I think this use is a stretch. I would substitute “about” for “on.”

    He asked my opinion about the matter.

    More and more it seems that writers have forgotten the word “about” and use “on” instead, a rather annoying tendency.

  53. junami_pH on April 20, 2009 11:47 am

    hi!

    Please explain the difference of errands and chores..

    I really find this website very helpful for me especially that I am an english teacher here in the Philippines

  54. Jes on April 23, 2009 9:14 pm

    Errands: Getting things done out of the house. Going to the store, going to wash your car, etc. Doing something out of the house.

    Chores: Doing things in the house, like doing laundry, cooking, cleaning the bathroom, paying the bills, etc.

    Correct me if I’m wrong.

  55. Kathy in RI on May 7, 2009 3:58 am

    We are going on vacation. We will go in the car, in the camper, in the truck.

    We will go on a plane, on a boat, on a train, on a bus.

    this doesn’t help:
    use in with bodies of water, use on with surfaces.
    nor this: in mainly denotes “rest at”
    on indicates proximity and position above or outside.

    I wonder if it’s because someone else is driving the plane, boat, train or bus. But the vacationer would be driving the car, camper, truck.

    hmmmmm

  56. DArren on May 12, 2009 8:27 am

    The question above is possibly because we have to bend to get in a car ect..
    We can walk on a plane ect…

    That is what I was told anyway..
    Correct me if I am wrong.

    New to this site but willing to help if I can

  57. J.C. on May 25, 2009 5:19 am

    Mike, include more details. This is what I think is the correct usage:

    “If you need me, I am in the back”

    “If you need me, I am in the back of the garbage bin” (if you are inside the garbage bin, in the back of it)

    “If you need me, I will be in the back”

    Anybody please feel free to correct me, if needed.

  58. Irshad86 on June 10, 2009 10:14 am

    For further reading

    http://owl.english.purdue.edu/owl/resource/594/01/

    Hope this can help ;)

  59. Sathish on June 16, 2009 2:31 pm

    Thx a lot..!!! It was very helpful.
    But i am still confused with this sentence below. Reading above i understand both are correct. Correct me if i am wrong. Also please explain.

    Mike is working on billing module.
    Mike is working in billing module.

  60. Vinod on August 21, 2009 4:00 am

    Which is correct
    “the ships sail in the water ”
    or
    “the ships sail on the water”

  61. Frank on August 26, 2009 1:25 pm

    I have a doubt. Should we say on October 2008 or in October 2008. I know we use in for months and years (in December, in 2009) but how about the two together. I speak English as a foreign language so I’m not that accurate in using prepositions. :S Thanks for your help

  62. ben on October 1, 2009 3:01 am

    I need your comment because I’m confused what to use “write your answer on the blank” or “write your answer in the blank”

  63. Tt on October 10, 2009 6:57 pm

    I love you all for your questions and comments ! Maybe I will finally stop thinking I’m a certified num skull, and that error is human. Please do you say your birthday has passed or past? Which one is right? You get a treat if you got it rigth or if you get it right?

  64. Maeve Maddox on October 12, 2009 7:28 pm

    Tt,
    Your birthday has passed.
    BUT
    Your birthday is past.

    Check it out: http://www.dailywritingtips.co.....with-past/

    You get a treat if you get it right. (Spoken before the person takes the test.)
    You get a treat if you got it right. (Spoken after the person has taken the test, but before the test has been graded.)

  65. Tt on October 13, 2009 7:03 pm

    Thanks so much Maeve. You are great!

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