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 3 {( I& ]9 ~3 g/ T. j
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我个人觉得这两种说法都可以。2 k; K4 v$ k, x; u) h! s$ N( N( E
1. Couldn't do有表示past impossibility的用法。
5 M) Y5 e2 E& P. X2. 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). ! V& ]' W2 l5 h1 J* p5 U/ e
9 I1 s; {3 q2 H/ S( w: kpearsonlongman.com也对couldn't have done的用法作了一番解释。0 I1 H5 |5 [0 I
1. Couldn't have expresses past impossibility of an idea being true. ) X' u9 @* X O% V
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.; {+ i+ |, p7 K; A4 ?4 b
3. Non-conditional uses of couldn't have abound. It occurs to express impossibility in past time narratives or commentary.$ L7 Y }% O8 [ E
4. With actions that take some ability or skill, it means didn't have the ability or skill to.- Q5 F9 x" O; y+ a; n" ?) S
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针对第三点给出的例句：
& y% E+ ?9 a) j5 Q& I9 s. f" u* c(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...9 d5 \3 D+ t% Q7 x% F) [3 h
(m) As a young woman who had never given birth before, she couldn't have known what the experience of childbirth would be like...
+ c+ a: w6 e W r* s(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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