2 задание.
1.am
2.is
3.is
4.is
5.are
6.are
7.is
8.am
9.are,are,are
3 задание

1) I am not a student
Are you a student?
2)my cousin is not a doctor
is your cousin a doctor?
3)Those young men are not tall
Are those young men tall?
4.задание
boxes,men, factories, children, teeth, knives, flats, ties, brushes, books, lights, cups, lives, rooms, boys, families, houses

7задание.
1.is
2.are
3.is
4.are
5.is