互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本，课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒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.
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