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。
couldnt的用法比could要稍为广泛一些:
We couldnt 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 hasnt 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。
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