MODAL VERBS (ANSWERS I1A)

1 shouldn´t   2 don´t have to   3 mustn´t   4 should   5 must   6 should   7 mustn´t   8 don´t have to   9 shouldn´t   10  should   11 mustn´t   12   ought

a  2 mustn´t  3 both   4 had to   5 both   6 don´t have to
b  2 don´t have to   3 must /have to   4 should   5 mustn´t  6 must/have to   7 shouldn´t   8 don´t have to