Write This is or These are

1)... his clothes
2)...a book
3)...a computer
4)...my trousers
5)...dishes
6)...a teacher
7)...exercise book
8)...a problem
9)...a castle
10)...birds

1. These
2. This
3. This
4. These
5. These
6. This
7. This
8. This
9. This
10. These

Правило:
Мы употребляем This is,когда говорим о единственном числе (computer). Мы употребляем these are ,когда говорим о множественном числе (computers)

1)these are
2)this is
3) this is
4) these are
5)these are
6)this is
7)this is
8)this is
9)this is
10)these are