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he did his homework at yesterday改否定句
问题描述
he did his homework at yesterday改否定句求高手给解答
- 精选答案
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首先，这是个病句，yesterday 是惯用语，直接做时间状语，不加任何介词，所以须去掉at。
这个问题得先把病句纠正成正确的陈述句再改写成否定句。He did his homework yesterday.改成否定句:He didn't do his homework yesterday,或者He did not do his homework yesterday.
- 其他回答
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He didn't do his homework yesterday.英语句改为否定句，第一步要找谓语动词，当谓语为实意动词时要借助助动词实现否定，这里是过去式，所以助动词用didn't，助动词后面接动词原形，原来的did改为原形do,这里的do不是助动词，而是实意动词 。
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