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when do we use the s- form of the verb?


Sagot :

The - S form is very commonly used for main verbs and auxiliary
verbs in the 
simple present tense when the subject is or means
he, she, or it. The - S form is also very commonly used as a full
(has) or contracted ('s) auxiliary verb in the 
present perfect tense
when the subject is or means he, she, or it.
we use that when the verb is singular
when the verb is in base form