肯定句变否定句的三点注意
英语课
一、变否定句时相关词的改变
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 1，already 2改为yet 3，and改为or等：
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 4 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 and dancing. 他喜欢唱歌和跳舞。
→He doesn’t like singing or dancing. 他不喜欢唱歌也不喜欢跳舞。
二、不变谓语动词而变其他词语
有时将肯定句变为否定句时，不改变谓语而改变其他词语：
Both of us went there. 我们两人都去了那儿。
→Neither of us went there. 我们两人都没去那儿。
Both Jim and Mary can sing this song. 吉姆和玛丽都会唱这首歌。
→Neither Jim nor 5 Mary can sing this song. 吉姆和玛丽都不会唱这首歌。
All of the books are worth 6 reading 7. 所有这些书都值得读。
→None 8 of the books are worth reading. 所有这些书都不值得读。
三、部分否定与完全否定
比较以下句子：
All of us laughed when we heard it. 听到这事时我们都笑了。(肯定句)
All of us didn’t laughed when we heard it. 听到这事时我们并未都笑。(部分否定)
Not all of us laughed when we heard it. 听到这事时我们并未都笑。(部分否定)
None of us laughed when we heard it. 听到这事时我们都没笑。(完全否定)
【注】可能涉及部分否定的词语有both, all, always, every等，即not both表示“并非两者都”，not all 表示“并非所有的都”，not always 表示“并非总是”，not every表示“并非每个…都”。
adj.任一，两方的；prep.任一，随便任一个；conj.或，也
- I have bought two books,you can have either.我买了两本书，你要哪一本都可以。
- I don't think either of them are at home.我想他们中任何一个都不在家。
adv.已经
- We have eaten already.我们已经吃过了。
- I've been there already,so I don't want to go again.我早已去过那里了，所以我不想再去了。
adv.还，仍然，即刻；conj.尽管，然而
- I am not ready yet.我还没有准备好。
- Beautiful as she is,she didn't find a boyfriend yet.尽管她很漂亮，但还没找到男朋友呢。
vbl.(see的过去分词)看见
- Since I left college, I have not seen him.自从我离开大学以后，就没有见过他了。
- I hope to have seen the film next week.我希望下星期能看到这部电影。
conj./adv.也不，也没有
- It is neither hot nor cold in winter here.这里冬天既不热也不冷。
- She can't get there at four,nor can I.她不能在四点钟到那里，我也不能。
adj.值钱；值得，具有..价值；n.价值，作用
- The book was old and it was not worth a cent.这本书旧了，一文不值。
- This novel is worth reading. 这部小说值得一读。
n.阅读，知识，读物，表演，对法律条文的解释；adj.阅读的
- Children learn reading and writing at school.孩子们在学校学习阅读和写作。
- He finds pleasure in reading.他从阅读中得到乐趣。
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肯定句