Learn what to say when you're making a guess about a past or present situation.

A HALLMARK for correctness in English grammar is subject-verb agreement, which demands that in a sentence, the subject and verb must always agree in number. If the subject is singular, its verb must ...

Grammar Reference Modal verbs: Might, may, could, must and can’t Meaning and use ...

Marianna Di Paolo, Double Modals as Single Lexical Items, American Speech, Vol. 64, No. 3 (Autumn, 1989), pp. 195-224 ...