练习:一.用never, ever, already, yet, for, since填空
1. I have _______ seen him before, so I have no idea about him.
2. Jack has _________ finished his homework ________ an hour ago.
3. Mr. Wang has taught in this school ________ ten years.
4. “Have you ________ seen the film?” “No, I have ________ seen it.”
5. “Has the bus left _______?” “Yes, it has _________ left.”
二.用since和for填空
1) ______ two years 2) _______ two years ago 3) _______ last month
4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock
7) ______ 4 hours 8) _______ an hour ago 9) _______ we were children
10) _____ lunch time 11) ______ she left here
1. He has lived in Nanjing ________ 3 year 。
2. I’ve known him __________ we were children.
3. Our teacher has studied Japanese _________ three years.
4. She has been away from the city ___________ about ten years.
5. It’s about ten years __________ she left the city.