enough一詞在英語(yǔ)中既可放在被修飾的詞之前,又可放在被修飾的詞之后.因此很多同學(xué)覺(jué)得enough 很難理解.其實(shí)這涉及到enough的詞性問(wèn)題.請(qǐng)看下面幾個(gè)例句：
1.He is not old enough to go to school.他年齡太小,不能去上學(xué).
2.But there were not enough people to pick them.但是沒(méi)有足夠的人采摘它們.
3.Six bottles of wine will be enough.六瓶葡萄酒就夠了.
要想搞清楚上面3個(gè)句子中enough的詞性及含義,得先掌握它的用法規(guī)律.
[一號(hào)檔案] enough作副詞用時(shí),意為“充分地；足夠地”,通常要把它放在所修飾的形容詞、副詞或動(dòng)詞的后面,常與不定式或介詞for連用.如：
1.You don't practise enough at the piano.你鋼琴?gòu)椬嗑毩?xí)得不夠.
2.Is the river deep enough for swimming?河水夠深來(lái)游泳嗎?
[二號(hào)檔案] enough作形容詞,意為“充足的；足夠的”,在句中可作定語(yǔ)或表語(yǔ).作定語(yǔ)時(shí),一般放在它所修飾的名詞前面.如：
1.I have enough money to buy a colour TV set.我有足夠的錢買臺(tái)彩電.
2.Fifteen minutes is enough time for you to have a coffee.15分鐘夠你喝杯咖啡了.
[三號(hào)檔案] enough也可作代詞用,意為“充分;足夠”.如：
I have had enough,thank you.我吃飽了.
看了以上有關(guān)enough的用法檔案,同學(xué)們不難發(fā)現(xiàn)：在例句1中,enough是副詞,作狀語(yǔ),用來(lái)修飾形容詞old；而在句2中,enough是形容詞,作定語(yǔ),修飾名詞people;句3中enough 是代詞.
參考資料：前人回答