TA的每日心情 | 慵懒
2019-1-23 10:04 |
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签到天数: 122 天 [LV.7]常住居民III
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发表于 2018-9-20 17:34:20
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本帖最后由 trivialstuff 于 2018-9-20 19:01 编辑
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我个人觉得这两种说法都可以。2 m6 J, B2 t2 `% N6 |0 b5 U
1. Couldn't do有表示past impossibility的用法。
+ q) X6 j$ d* G' v1 S- l2. Couldn't have done表示past impossibility时，给我比较强的潜台词意味，我会倾向于补充更多细节。 （更新：感觉这个语境里还带了层but now I know的意思。）比如I couldn't have known this morning that it would rain tonight (, because the weather was so damn good. But now I know. It's already started raining, and the weather forecast says it's going to be all night long).
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1 s. b6 y5 N& k' A# t2 h$ ~pearsonlongman.com也对couldn't have done的用法作了一番解释。
0 j! x* {8 w, N v9 d5 X# Q/ K4 F1. Couldn't have expresses past impossibility of an idea being true. 9 [& ]2 P/ x2 n( D t. I7 _% m
2. In addition to its use in full past hypothetical conditionals, as Rachel has explained, it is found in incomplete conditionals, utterances in which the if- clause is merely implied.
3 Q d$ b$ o* t. t" K3. Non-conditional uses of couldn't have abound. It occurs to express impossibility in past time narratives or commentary.
! r8 w! G4 s2 L6 _' K* L3 j4. With actions that take some ability or skill, it means didn't have the ability or skill to.! E5 g% R- y! T( k
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针对第三点给出的例句：
5 e, ?5 p5 s+ `! C' j7 K" {0 B(l) [He] couldn't have known that just six hours later, he, the only male flight attendant on American Airlines Flight 11, would die suddenly when...
1 O% L5 o$ i# H, c3 n(m) As a young woman who had never given birth before, she couldn't have known what the experience of childbirth would be like...
5 e" y- C2 t+ y4 a6 D(n) Athletic Director Edgar Johnson couldn't have known what he was getting into when he made that fateful decision to cut the Delaware wrestling program on June 18
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