Read these sentences.
1. The child laugh at the clown.
2. The children laugh at the clown.
The verb in sentence (1.), 'laughs' is a singular verb because the subject 'child' is a singular subject.
In sentence (2.), the subject is 'children' which is a plural noun and so the verb also changes to a plural verb 'laugh'.
Every sentence has a subject and a verb and the subject and the verb must agree in number.
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