Both you and I know this. 你和我都知道这事。
Neither you nor I know this. 你和我都不知道这事。
He can speak both English and French. 他既能讲英语，又能讲法语。
He can speak neither English nor French.他既不会讲英语，也不会讲法语。
both,all的区别和用法
all ,both,表示“都”,“全部”.
(1) both指两个人或物,而all指三个以上的人或物,在句中都可作主语、宾语、表语、同位语或定语.
Both of us want to go.我们两人都想去.
All of us should work hard.我们都应努力工作.
(2) both和all都可直接修饰名词;名词前如有限定词时,其前只能用both of或all of.
Both brothers are clever.兄弟俩都聪明.
Both of the books are useful.两本书都有用.
(3) both和all在句中的位置是位于be动词之后,行为动词之前,如有情态动词或助动词,则位于情态动词或助动词与主动词之间.
We are all here.我们都来了.
[特别提醒]
(1) both的反义词是neither,all的反义词是none.
Both of us are not doctors.我们俩并非都是医生.(部分否定)
Neither of us is a doctor.我们俩都不是医生.(全部否定)
All of the books are not helpful.并非所有这些书都对人有帮助.(部分否定)
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