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The subject and the verb must agree with each
other. Subject/Verb agreement is a concern
in most tenses.
In present tense verbs, singular nouns agree with singular verbs and plural or compound nouns agree with plural verbs.
singular subject singular action verb(singular action verbs end in s)
The child walks to school.
Elise plays basketball.
The student studies at the library every day.
plural subject plural action verb (plural action verbs do not end in s)
The children walk to school.
Elise and Jane play basketball.
The students study at the library every day.
singular subject singular linking verb(is)
The child is a walker.
Elise is excellent at basketball.
The student is a strong academically.
plural subject plural linking verb (are)
The children are walkers.
Elise and Jane are excellent at basketball.
The students are strong academically.
It is fast.
All the above examples show subject/verb agreement in the simple present tense. Subject/Verb agreement is a concern in other present tenses as well.
Tom has seen the movie three times.
He has seen the movie three times.
I have seen the movie three times.
Tom and Byron have seen the movie three times.
Tom is watching the movie right now.