both是兩者都，all是三者及三者以上都。例如，You can take both of them。All the books are useful to us。

both、all有何區(qū)別

all全、都（三者以上），既可修飾可數(shù)名詞也可修飾不可數(shù)名詞。

All the books are useful to us.

All knowledge comes from practice.

all與否定詞not連用為“部分否定”，表示“不是所有的……都……”

I don't know all of them. 他們當(dāng)中我并不都認(rèn)識(shí)。

All don't agree with you.=Not all agree with you. 并非所有人都同意你。

both兩者都

You can take both of them.兩個(gè)你都可以拿去。

與否定詞連用表示“部分否定”。

I don't know both of them.他倆我并非都認(rèn)識(shí)。

both...and...雙方都……

He can both sing and dance.他能歌善舞。

both和all詞義辨析

1、both 只能與復(fù)數(shù)的可數(shù)名詞連用，與可數(shù)名詞的復(fù)數(shù)形式連用時(shí),both則指兩個(gè)。

You were both a prey to compulsions.你倆都太沖動(dòng)了。

2、all可與可數(shù)名詞的單、復(fù)數(shù)或不可數(shù)名詞連用，與可數(shù)名詞的復(fù)數(shù)形式連用時(shí), all指三個(gè)或三個(gè)以上。如：

All children deserve encouragement.所有的孩子都應(yīng)得到鼓勵(lì)。

both和all詞語搭配

1、both

1）both of them 他們倆都…

2）both and 兩個(gè)都；既...又...

3）both the two 兩者；并

2、all

1）at all （否定句）根本；究竟

2）after all 畢竟；終究

3）above all 首先；尤其是