The committee wrote the manual. (single noun acting as the subject)Only the grammatical subject of a clause determines the number of the verb. If the subject is singular, the verb must be singular. If the subject is plural, the verb must be plural.
She won the race. (pronoun acting as the subject)
To win the race became his passion. (infinitive phrase acting as the subject)
Achieving success remained his principal goal. (gerundive phrase acting as the subject)
That she won the race didn't surprise us. (nominal clause acting as the subject)
Our biggest problem is the thousands of cars clogging the streets.
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