3.
1) must (exemplu deja completat)
2) must
3) musn't
4) can
5) musn't
6) can
7) must
8) musn't
4.
1) There is
2) There are / there is
3) Is there / there isn't / there is
4) Are there / there are
5) there are
Recomand sa incerci sa le intelegi. Te ajuta sa stii limba si astea sunt lucruri elementare.