否定：

全部否定和部分否定：

eg. All the birds can not fly. Not all the birds can fly. 不是所有的鸟都会飞。

1. 部分否定

eg. All the birds can not fly. 并非所有的鸟都会飞。

None of the birds can fly. 所有的鸟都不会飞。

代词或副词如all， both，every，everybody， every day， everyone， everything， everywhere等与not搭配使用时，表示部分否定，意思为“并非都是“等。

eg. All is not gold that glitters. 发光的并非都是金子。= Not all is gold that glitters.

2. 全部否定

英语中常用not， none， nobody， nothing， nowhere， neither， never等表示全部否定的概念。

eg. Nothing in the world is difficult for one who sets his mind to it. 世上无难事，只怕有心人。

eg. W： Daddy， I ’ve decided to give up science and go to business school.

M： Well， it is your choice as long as pay your own way， but I should warn you

that not everyone with a business degree will make a successful manager.

Q： What do we learn from the conversation？

A. The man doesn’t have money for his daughter’s graduate studies.

B. The man doesn’t think his daughter will get a business degree.

C. The man insists that his daughter should pursue her studies in science.

D. The man advises his daughter to think carefully before making her decision.