Fill in the Blanks C18U6LB Grammar Extra 2AOnline version Complete the the grammar chart. by Modern English 1 must can't may not must is guesses not not make could possibilities may possible might must not might not may might can't could Possibility modals in the affirmative and negative . 1 . Use ( not ) , ( not ) , and ( not ) to . Not generally contracted . We / have to end this meeting early . We / have time for a lot of questions . The principal isn't here . She be busy today . The meeting is almost over . The principal be coming . 2 . You can also use to talk about , but it often becomes in the negative and means " it's . " The projector is brand new . It be broken . But it be unplugged .