Run - Ran - Run
present - past - past
1) Nick can ride a bike, but he doesn't like to ride a bike.
1. Jack studied at the university until he was 23
2. The teacher told the pupils to do their homework for tomorrow.
3. Because John wanted it
4. He told the teacher the correct answer
5. My favourite season is summer
6. Because I have my birthday.
1 The scientist has already written his article
2 Andrew's hamster has just eaten his food
3 The boys found an old cage in their garden
4 They haven't discussed the problem yet
5 Charles has just finished his translation
6 They went to the theater last week
7 My cousin has been to the theater three times week
8 His niece has just written the invitation letters
9 Helen came home, had a short rest, and then began to help her
10. ....your relatives took part in demonstration yesterday
2. Trees, birds, animals, grass, plants, mountains, valleys, parks, butterflies
3. 2) mustn't
3)can
4)must
5)mustn't
6)mustn't
7)can
8) must