Comment on the types of clauses and the use of tenses. I. I don't know when my brother will come home. If he comes after seven, he will miss the TV serial. 2. He won't tell you anything if you don't ask yourself. But I'm not sure if you will be brave enough to ask. 3. When Peter returns, he will help us, but I don't know when he will return. 4. If it stops raining, we shall go to the park. But I am not sure if it will stop raining today.

1. Do you have any garden tools? 2. A dishwasher is very useful invention. 3. Where does this road go? 4. Where were nuclear weapons first produced, in Europe or the USA? 5. Sew decided to improve her literature grades. 6. Diana has an eventful life. 7. Sergey is an engineer. He has a lot of practical and technical skills. 8. I don't know anything about this plant. I know only know that they try grow it in the north. 9. It is useless to grow flowers on this soil. It is very bad. 10. Trade helps to improve contacts between countries.

. They were having tea when I  came home. 2. He was walking along the river when a boat was passing. 3. We  listened to an interesting lecture on UFOs yesterday. 4. When I  entered the classroom, the teacher was writing words on the blackboard and the pupils were coping them into their exercise-books. 5. They were  getting ready to go out when it began raining. 6. Yesterday at one o’clock I had lunch. 7. When he  came in, I was doing my exercises. 8. What  were you  doing at eight o’clock yesterday? 9. At this time yesterday I was riding home by my bicycle. 10. You were sleeping when I went out. 11. I was walking along the street with my friend when a tram was passing. 12. We were discussing our plans for the weekend when Nick  rushed into the room. 13. I was coping files from my flesh-card when suddenly the computer hung. 14. Yesterday my sister  celebrated her birthday. The telephone rang the whole day. 15. The doctor  examined the patient the whole week but did not find the cause of his pains.