Tham khảo tài liệu 'understanding and using english grammar part 71', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 5 ADVERB CLAUSES OF TIME AND REVIEW OF VERB TENSES EXERCISE 1 p. 65. ANSWERS 2. By the time I return to my country I will have been away from home for more than three years. 3. As soon as I wiU graduate I am going to return to my hometown. 4. By the end of the 21st century scientists will have discovered the cure for the common cold. 5. I want to get married but I haven t met the right person yet. 6. I have seen that movie three times and now I want to see it again. 7. Last night I have had dinner with two friends. I have known both of them for a long time. 8. I don t like my job at the restaurant. My brother wants me to change it. I think he is right. 9. So far this week the teachers have given us a lot of homework every day. 10. There have been more than forty presidents of the United States since it became a country. George Washington was the first president. He became the president in 1789. 11. While I am studying tonight I m going to listen to Beethoven s Seventh Symphony. 12. We washed the dishes and cleaned up the kitchen after our dinner guests left had left since I was a child tomorrow morning. earthquake in California in the next few years. last night I used my key to open the door as usual. But the door didn t open. I tried my key again and again with no luck. So I knocked on the door for my wife to let me in. Finally the door opened but I didn t see my wife on the other side. I saw a stranger. I had been trying to get into the wrong apartment I quickly apologized and went to my own apartment. 13. My neighbors are Mr. and Mrs. Jones. I have known them ever 14. It will rain tomorrow morning. I It is probably going to rain 15. Many scientists believe there will be is going to be a major 16. When I got home to my apartment EXERCISE 4 p. 68. ANSWERS 1. is studying. . . is also taking. . .begin 2. had already eaten. . .left. . . always eats. . .goes. . .goes. . . will eat will have eaten 3. called. . .was attending 4. will be attending 5. got. . . was