doesn't, not don't
In English, the third person singular (he, she, it) requires 'doesn't' instead of 'don't'.He don't like coffee.
He doesn't like coffee.
has, not have
For the third person singular, use 'has' instead of 'have'.She have two brothers.
She has two brothers.
were, not was
Use 'were' for plural subjects in the past tense, not 'was'.They was late.
They were late.