Образуйте условные предложения. Не забудьте о смешанных случаях.

1. Не is not a first-class sportsman now because he did not train enough last year. If ... 2. The pupils were active because they wanted to understand this difficult material. If ... 3. The pupils did not understand the homework because they were inat¬tentive. If ... 4. The pupils worked hard and did well in their examinations. If ... 5. She won't try to enter the foreign languages department because she is not good at foreign languages. If ... 6. I shall go to the dentist because I have a toothache. If ... 7. He is groaning with pain now because he did not go to the dentist to have his tooth filled. If ... 8. She does not go to the polyclinic because she does not need any treatment. If ... 

1.If he trained enough last year, he would be a first-class sportsmen now.

2.If the pupils are active they'll understand this difficult material.

3.If the pupils were attentive, they would understand the homework. 

4.If the pupils didn't work hard, they wouldn't do well in their examinations. 

5.If she was good at foreign languages, she would try to enter the foreign languages department.

6.If I have a toothache I'll go to the dentist.

7.If he went to the dentist to have his tooth filled, he wouldn't groan  with pain now.

8.If she needs any treatment, she'll go to the polyclinic.