基本信息
句式句型专题 (教师版).（一）按使用目的可分为陈述句、疑问句、祈使句和感叹句。
1） 陈述句（Declarative Sentences）：说明一个事实或陈述一种看法。
Light travels faster than sound. 光比声速度快。 （说明事实）
The film is rather boring. 这部电影很乏味。
（说明看法）
这里我们侧重讲述否定句
一.概念
否定句指否定陈述句的句子.
二.相关知识点精讲
1.用not构成的否定句：主语+助动词/ be+not+…
例句：
He is not back yet.
It is not true.
We haven’t forgotten you.
You shouldn’t be so silly.
We haven’t been invited yet.
He won’t go, but they will.
Money could not buy happiness.
I like the salad, but I don’t like this soup.
He wants a girl friend, but he doesn’t want to get married.
You didn’t understand what I said, did you ?
You needn’t try to explain.
I didn’t use to like opera, but now I’m getting interested.
I usedn’t to like opera, but now I’m getting interested.
2.祈使句的否定句：Don’t+动词原形…。
例句：
Don’t worry. I’ll look after you.
Don’t believe a word he says.
Don’t be so rude.
3. 非谓语动词（不定式，分词，动名词）的否定式：把not放在to do; doing; 的前面。
It’s important not to worry.
He said he deeply regretted not being able to help.
Not knowing what to do, Shelly asked advice of her friend.
He reproached me for not having told it to him.
4. not与除谓语以外的其他句子成分连用：
Come early, but not before six.
It’s working, but not properly.
I believe he will succeed, though not without some difficulty.
not用在I hope; I believe; I’m afraid; I guess; I suppose; I expect之后，构成省略句。
—Will it snow today ?
—I hope not.
