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enough用作形容詞時(shí)表示足夠的，充分的；在句子中多作定語(yǔ)。用作副詞時(shí)表示足夠，充分；一般放在所修飾的形容詞、副詞或動(dòng)詞后。用作名詞時(shí)在句中用作主語(yǔ)或賓語(yǔ)。

一.enough用作形容詞

1.enough作形容詞時(shí),意思是“足夠的,充分的”,在句中多作定語(yǔ),一般修飾復(fù)數(shù)名詞或不可數(shù)名詞,可置于所修飾的名詞之前,也可置于所修飾的名詞之后。后者屬于舊式用法。

2.當(dāng)主語(yǔ)是it或是特定數(shù)量時(shí), enough也可用作表語(yǔ),其后常接for引起的短語(yǔ)或動(dòng)詞不定式。

3.用作定語(yǔ)

（1）～+ n.

We have enough salesmen to cover the area .我們本地區(qū)有足夠的售貨員。

We have enough money to buy a car.我們有足夠的錢購(gòu)買一輛小汽車。

（2）n. +～

The fellow has cheek enough.那家伙臉皮厚。

We don't have time enough to finish the work.我們沒(méi)有足夠的時(shí)間去完成這項(xiàng)工作。

4.用作表語(yǔ)

（1）S+be+～

Five men will be quite enough.五個(gè)人就足夠了。

（2）S+be+～+for n./pron.

Two apples is/are enough for me.兩個(gè)蘋果對(duì)于我足夠了。

（3）S+be+～+to- v

If each of us kicks in a small amount, it'll be enough to buy things for the party.

我們每一個(gè)人捐一點(diǎn)錢的話,就足夠買聯(lián)歡會(huì)所需要的東西了。

二.enough用作副詞

1.enough用作副詞時(shí),意思是“足夠,充分”,一般應(yīng)放在所修飾的形容詞、副詞或動(dòng)詞的后面。

2.enough還可作“相當(dāng)?shù)亍薄斑€可以地”解,這時(shí)在語(yǔ)氣上起弱化作用,即語(yǔ)氣上比不加enough時(shí)為弱。

I don't know him well enough to ask him for help.

我和他不夠熟,不便請(qǐng)他幫忙。

He didn't run fast enough to catch the train.

他跑得不夠快,沒(méi)有趕上火車。

三.enough用作名詞

enough用作名詞表示足夠，充分，足量，滿足等含義。主要在句中用作主語(yǔ)或賓語(yǔ)。

Not enough is known about this subject.

對(duì)這個(gè)問(wèn)題的了解還不夠。

I've had enough, thank you.

我吃飽了,謝謝。