Commas Exercise (207)

Edit the following sentences by inserting commas as needed.

Answers and Explanations

1.
Original: The new study which is due to be released in August documents attitudinal changes in U.S. public education from Thomas Jefferson to David Coleman.
Correct : The new study, which is due to be released in August, documents attitudinal changes in U.S. public education from Thomas Jefferson to David Coleman.

The parenthetical "which clause" is set off from the rest of the sentence with commas.

2.
Original: As the crowd swelled more police were sent in to preserve order.
Correct : As the crowd swelled, more police were sent in to preserve order.

The introductory clause, "As the crowd swelled," is set off by a comma to separate it from the main clause.

3.
Original: The winter has been harsher than usual and frequent snow has caused several school closings.
Correct : The winter has been harsher than usual, and frequent snow has caused several school closings.

A comma is needed to separate the two independent clauses joined by and.

4.
Original: The composting area contains several different styles of compost bins in which garden refuse decomposes into soil.
Correct : The composting area contains several different styles of compost bins in which garden refuse decomposes into soil.

The original sentence is correctly punctuated.

5.
Original: On April 18 1775 Paul Revere is said to have made his famous ride.
Correct : On April 18, 1775, Paul Revere is said to have made his famous ride.

A comma separates the month and day from the date; another comma separates the lengthy introductory phrase from the rest of the sentence.

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