Question

单句改错

1．It was in the classroom which we had the class meeting yesterday．

2．It is to help others what his duty is．

3．It was until he told me about it that I learnt the truth．

4．You must look around after you cross the road．

5．He was walking along the sands as he saw a big footprint in the sand．

6．As is known to all that Taiwan is one part of China．

Answer 1

答案：
解析：

　　答案：1．which→that

　　提示：强调句中除被强调部分为人时可用who/whom外，其他一律要用that。

　　答案：2．what→that

　　答案：3．until前加not

　　提示：not…until直到……才，在强调句中要把not until放在一起。

　　答案：4．after→before

　　提示：根据句子意思应是在此之前。

　　答案：5．as→when

　　提示：as引导的时间状语从句中的动词要用进行时态。He was walking along the sands when he saw a big footprint in the sand．＝As he was walking along the sands he saw a big footprint in the sand．

　　答案：6．As→It

　　提示：it为形式主语，真正的主语为后面的从句；as引导非限制性定语从句放于句首，并用逗号隔开。