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你知道was able to與could的區(qū)別嗎

下面這一題你會(huì)做嗎?

The fire spread through the hotel quickly but everyone __________ get out.

A. had to                        B. would                        C. could                         D. was able to

此題應(yīng)選D。容易誤選C(could)。這里主要涉及could與was able to的用法和區(qū)別：

1. 表示過(guò)去一般性能力時(shí) (即某人想干什么就能干什么能力)，兩者都可用：

He could [was able to] run very fast when he was a boy. 他小時(shí)候跑得很快。

2. 表示過(guò)去特定的能力 (即某人在某一具體場(chǎng)合做某事的能力，往往暗示經(jīng)過(guò)努力才具備的能力)，通常用was(were)able to，也可用managed to do sth或succeeded in doing sth，但是不能用 could：

他學(xué)習(xí)很努力，所以考試及了格。

正：He worked very hard and was able to [managed to] pass his examination.

誤：He worked very hard and could pass his examination.

正因?yàn)榇嗽�因，所以上面一題的答案用 ...was able to get out，而不用...could get out，因?yàn)榇祟}談及的是一種特定場(chǎng)合的具體能力。(m.52ysedu.com)

但值得注意的是，以上用法只適合于肯定句，若在否定句中，則可用couldn’t代替 wasn’t [weren’t] able to：

He worked hard but wasn’t able to[couldn’t] pass the exam. 他學(xué)習(xí)很努力，但考試卻未能及格。