could也能表示过去的一般的允许:
9 Q6 L; }) _1 S0 F3 T1 I On Sundays we could(=were allowed to)stay up late.+ P( h: N9 F X/ ]
星期天晚上我们能到较晚才睡。
6 W: Q, o! ?% J6 A 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:) N3 F' S3 z1 ]6 h+ Q, `: i) P( r
I had a visa so I was allowed to cross the frontier.& {. S6 d. w$ Y7 q
我有签证,所以我被允许越过边界。
0 @- R2 u$ [: F: q couldn't的用法比could要稍为广泛一些:
! }! u# E0 W2 b3 A1 } We couldn't bring our dog into the restaurant.
! e/ F9 W% o; Q. P" d' B! \. F3 w 我们不能把狗带进饭馆里。
: s9 r& x5 A- w- d# q 与此相反的意思应当用allow表示:+ ]# C* c B5 l6 q1 d
We were allowed to bring…7 z9 X0 p) m; f! F) C# s1 R
允许我们把狗带进……,4 v3 {: L7 p, j/ w6 N @
如欲使用完成时和被动语态,则必须用 allowed:8 I3 O1 t# A) D+ \
Since his accident he hasn't been allowed to drive.
. K" `5 B; j) u 自从他出了车祸以后就不允许他再开车了。
- b7 f* x5 |% i- Z" t As a child he had been allowed to do exactly what he liked.
$ D) [9 n, E, j" M5 W 他小时候,容许他爱干什么就干什么。 |