4. Third person (singular)

IRREGULAR VERBS

·         be --> is               He is a boy            ( You cannot say bes!)

·         have --> has         She has a dog      ( You cannot say haves!)

 

MODAL VERBS

Such as      can, must, should, may and might, do not take -s in the third person singular present because, modal verbs do not take endings at all. 

·         She can speak three languages.

He must like football a lot