英语句型转换之一肯定句变否定句的方法技巧.doc

英语句型转换之一
——肯定句变否定句的技巧
请同学们记住以下单词:
1、be动词的五种形式:am, is, are, was, were;
2、情态动词:can, could, may, might, must, shall, should, will,would, need, had better
3、助动词:have, has, had
一、动词后直接加not
原句中含有be动词(am, is, are, was, were) 和情态动词(can, shall, will, may, should, would, might, had better等)时,要在动词后直接加not。如:
1. I am a teacher. → I am not a teacher.
2. Li Lei can swim. → Li Lei cannot( can't )swim.
3. He will go to the zoo if it rains tomorrow.
→ He will not(won't)go to the zoo if it rains tomorrow.
4. We have learned 3,000 words.
→ We have not( haven't )learned 3,000 words.
二、原句中没有be动词,助动词或情态动词时,要在行为动词前加助动词(do, does, did)与否定副词not的缩写形式。
1. 句中第一个动词是原形时,在其前加上don’t。如:
I get up at six o'clock every day.
→ I don't get up at six o'clock every day.
2. 句中第一个动词是三单形式时,在其前加上doesn’t,原来的动词三单形式改为动词原形。如:
Mr Wang works in a factory.
→ Mr Wang doesn't work in a factory.
3. 句中第一个动词是过去式时,在其前加上didn’t,原来的动词过去式改为动词原形。如:
Xia Lin visited our friends last night.
→ Xia Lin didn't visit our friends last night.
三、肯定句变否定句的七点注意
1. 肯定句变否定句时,除将谓语变为否定式外,句中其他词语也可能随之改变,如将some改为any,too和also改为either,already改为yet,and改为or等。如:
There are some birds in the tree. 树上有些鸟。
→There aren’t any birds in the tree. 树上没有鸟。
He likes the girl, too. 他也喜欢这个女孩。
→He doesn’t like the girl, either. 他也不喜欢这个女孩。
We have already seen the film. 我们已看过这部电影。
→We have not seen the film yet. 我们没有看这部电影。
He likes singing an