1. be+not与do+not
I am not happy.
我不高兴。
I do not take the job of teaching.
我没有接受教书这份工作。
We do not know how to do it.
我们不知道如何去做这件事。
They do not get the news.
他们没有得到这个消息。
2. do+not缩写成don't的形式
I don't know how to do it.
我不知道如何做这件事情。
He doesn't finish his work.
他没有完成他的工作。
We don't join the club.
我们没有加入这个倶乐部。
They don't phone us as early as possible.
他们没有尽快给我们打电话。
3. 第三人称单数does+not
She doesn't eat pizza.
她不吃比萨。
He doesn't know my telephone number.
他不知道我的电话号码。
Tom does not watch too much TV as it is bad for eyes.
汤姆不看太多电视因为那对眼睛有害。
She doesn't get to school by bus.
她不坐公交车上学。
4. never, seldom, hardly等否定词
She never swims.
她从不游泳。
He seldom gets up early.
他很少早起。
They hardly miss any important meetings.
他们几乎没有错过重要的会议。