The use of prepositions is tricky, even for native speakers. Certain prepositions are used with certain words, while others are not. Here are four examples of nonstandard usage.
Incorrect: They were arrested and accused for murder.
Correct : They were arrested and accused of murder.
The preposition of follows the verb accused.
One may be “indicted for murder” or “tried for murder,” but one is “guilty of murder,” “suspected of murder” or “accused of murder.”
Incorrect: He stopped in the middle of the street to look back; the hurtling ambulance struck him in that moment.
Correct : He stopped in the middle of the street to look back; the hurtling ambulance struck him at that moment.
A moment is an extremely brief portion of time, an instant too brief to measure. In a literary context in which a character is experiencing an event in emotional “slow motion,” the phrase “in that moment” can be an appropriate stylistic choice to suggest that a great deal is happening within the instant. Likewise, the expression “to live in the moment” treats moment as having duration, as opposed to instantaneousness. In most prosaic contexts, however, the appropriate preposition is at:
At that moment he knew what his mother was thinking, and that she loved him.
Friendship is born at that moment when one person says to another: What! You too? I thought I was the only one.
Note: There is the polite expression “in a moment,” as in, “I’ll be with you in a moment.”
Incorrect: Wells told agents in Indianapolis that she left her home on her own accord and was not taken against her will.
Correct : Wells told agents in Indianapolis that she left her home of her own accord and was not taken against her will.
The noun accord in this expression means harmony or agreement. To do something “of one’s own accord” is to do something without coercion, freely, willingly.
Incorrect: I am excited for the new Apple watch.
Correct : I am excited about the new Apple watch.
The adjective excited is conventionally followed by the prepositions by, at, and about. Although growing in popularity with some speakers, the use of for after excited is regarded as nonstandard. Here are three more examples of standard usage:
Many dogs are excited by the presence of other dogs or humans.
She was excited at the prospect of living in London.
Royals fans [are] nervous and excited about their return to the postseason.