Составьте вопрос: the students/do/their laboratory work?

Did the students do their laboratory work? 

1. are singing -  сейчас -Present Continuous
2. buy -     обычно -Present Simple
3. is drinking - сейчас -Present Continuous
4. are walking - сейчас -Present Continuous
5. is laughing  - сейчас -Present Continuous 
6. is playing  - сейчас -Present Continuous
7. wear  -обычно -Present Simple
8. eats  -обычно -Present Simple
9. are sleeping  - сейчас -Present Continuous
10. do you go  -обычно -Present Simple
11. never eat  -обычно -Present Simple
12. don't like  -обычно -Present Simple
13. are you doing  - сейчас -Present Continuous
14. is walking  - сейчас -Present Continuous

If he were not busy, he would come. 

2. If she had studied well, she she wouldn't have got bad marks. 

3. If he hadn't broken his bicycle, he would have gone to the country. 

4. If he had practice, he would speak English well 

5. If I hadn't had a bad headache yesterday, I would have come to see you. 

6. If the ship hadn't been sailing near the coast, it wouldn't have struck a rock. 

7. If he had been in town, he would have been present at our meeting. 

8. If the pavement hadn't been so slippery, I wouldn't have fallen and hurt my leg. 

9. If the sea were not rough, we could sail to the island. 

10. If they hadn't made a fire, the wolves wouldn't have run away. 

1. Если бы он не был так близорук (short-sighted), он бы узнал меня вчера в театре. 

If he were not so short-sighted, he would have recognised me in the theatre yest