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Sentence Correction: Subject Verb Agreement - A Plural Subject Consisting of Singular Nouns that are Connected by 'and'

Of all the mistakes John has made in his life, lying to Jane and cheating on her is the one he regrets the most.  

Well done!

This answer choice corrects the Subject Verb Agreement mistake in the original question, by changing the singular verb is to the plural verb are to match the plural subject lying...and cheating.

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Incorrect.

This answer choice is grammatically incorrect. The subject lying to Jane and cheating on her consists of two words - lying and cheating - connected by the word and. The word lying in itself is singular, and so is cheating. However, the word and which connects them makes the subject plural.  

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Also, since lying and cheating are two activities, the singular form one is less accurate than the plural ones

Incorrect.

This answer choice repeats the original Subject Verb Agreement mistake. The subject lying to Jane and cheating on her consists of two words - lying and cheating - connected by the word and. The word lying in itself is singular, and so is cheating. However, the word and which connects them makes the subject plural.  

[[snippet]]

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake, by changing the singular verb is to the plural verb are, it creates a new one by changing the singular verb regrets to the plural regret.

Incorrect

This answer choice repeats the original Subject Verb Agreement mistake. The subject lying to Jane and cheating on her consists of two words - lying and cheating - connected by the word and. The word lying in itself is singular, and so is cheating. However, the word and which connects them makes the subject plural.  

[[snippet]]

Also, since lying and cheating are two activities, the singular form one is less accurate than the plural ones.

her is the one he regrets the most
her is the ones he most regrets 
her are the ones he regrets most of all
her are the ones he most regret
Jane is the one he most regrets