Fill in the Blanks C18U6LB Grammar Extra 2AOnline version Complete the the grammar chart. by Modern English 1 must might not possibilities not not could not can't could must make might possible might not may can't may may is must guesses 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 .