IV
1.can
2.must
3.must
4.mustn't
5.can't
6.must
7.musn't
8.must
9.must
10.must
I
1D 2D 3D 4C 5A
II
1.is-are learning
2.are you doing-am unloading
3.Does your mother walk-cycles
4.don't often play-are playing
5.Is Ba working-is sleeping
6.are your children-are playing