1 . 单句改错
1. Late although it was, we still went on working.
2. Although he is over eighty, but he looks healthy and energetic.
3. As they are poor, they are happy.

2 . 单句改错
1. Hard work have made him very ill.
2. Finally, there were a sudden pull at the pole and a fish was caught.
3. Generally speaking, when take according to the directions, the drug has no side effects.
4. Never before do I seen such a wonderful park, where I'd like to pay a visit again.
5. In front of our school stand a tower on whose top we can have a clear view of the lake.
6. They were two reasons for the decision.

3 . 每句一个错误，错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏词符号(∧), 并在其下面写出该加的词。
删除：把多余的词用斜线（＼）划掉。
修改：在错的词下画一横线, 并在该词下面写出修改后的词。
1. One of the quality that a good friend should have is honesty.
2. At about 3:00 am in July 28 1976, some people saw bright lights in the sky.
3. In the farmyards, the chickens and even the pigs were too frightening to eat.
4. Two third of the people were died or injured during the earthquake.
5. The army organized teams to dig out those who were trap, and bury the dead.
6. We will look after the children who parents lost their lives in the big earthquake.
7. It seems as if the world was at the end.
8. Norman Bethune worked selfish in China as a doctor during World War II.
9. Why did Nelson Mandela turn to for violence to make black and white people equal?
10. Never before in history a city been so completely destroyed.