Make subjects and verbs agree
In the present tense, verbs agree with their subjects in number (singular or plural) and in person (first, second, or third). The present-tense ending -s is used on a verb of its subject is theird-person singular; otherwise the verb takes no ending. Consider, for example, the present tense forms of the verb give:
SINGULAR PLURAL
FIRST PERSON I give we give
SECOND PERSON you give you give
THIRD PERSON
he/she/it gives
they give
Yolanda gives
parents give
The verb be varies from this pattern, and unlike any other verb it has special forms in boththe present and the past tense.
PRESENT-TENSE
PAST-TENSE
FORMS OF BE
FORMS OF BE
I am
we are
I was
we were
you are
you are
you were
you were
he/she/it is
they are
he/she/it was they were
Problems with subject-verb agreement tend to arise in certain tricky contexts, which are detailed in this section.
Hacker, Diana. A Pocket Style Manual. New York:
Bedford/St. Martin's. 2000.