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牛津实用英语语法 130 could或 was/were allowed to用来表示过

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could也能表示过去的一般的允许:

On Sundays we could(=were allowed to)stay up late.

星期天晚上我们能到较晚才睡。

当某一具体行为获准并付诸实施时,就必须用was/were allowed代替could:

I had a visa so I was allowed to cross the frontier.

我有签证,所以我被允许越过边界。

couldn't的用法比could要稍为广泛一些:

We couldn't bring our dog into the restaurant.

我们不能把狗带进饭馆里。

与此相反的意思应当用allow表示:

We were allowed to bring…

允许我们把狗带进……,

如欲使用完成时和被动语态,则必须用 allowed:

Since his accident he hasn't been allowed to drive.

自从他出了车祸以后就不允许他再开车了。

As a child he had been allowed to do exactly what he liked.

他小时候,容许他爱干什么就干什么。

(关于might/could在间接引语中的用法,参见第129节A。)

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