Глагол to be 1. i _ 7. 2. it_a book. 3. we_ pupils. 4. ann_my sister. 5.you_from england. 6. the dog_black. 7. tom and liz_good friends.

1. I am 7;
2. It is a book;
3. We are pupils;
4. Ann is my sister;
5. You are from England;
6. The dog is black;
7. Tom and Liz are good friends.