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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 ' f7 x4 a- U9 K8 I/ S" S
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我个人觉得这两种说法都可以。" T. I) p4 l' u- e K" E9 B% _
1. Couldn't do有表示past impossibility的用法。; h! h$ M% f7 H$ f1 z& ~9 r: O0 u
2. 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). - z w# z" Y( K1 c1 J* H ^$ C
- ^* {# M( w" T. qpearsonlongman.com也对couldn't have done的用法作了一番解释。
2 x7 D; O3 u$ O* V1. Couldn't have expresses past impossibility of an idea being true.
! D( Y; I/ v* p: q$ C& U2. 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 Z2 p' T$ b, _5 ?. z( I8 @8 K3. Non-conditional uses of couldn't have abound. It occurs to express impossibility in past time narratives or commentary.5 O; H2 v; L. n+ K# I
4. With actions that take some ability or skill, it means didn't have the ability or skill to.
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针对第三点给出的例句：
/ Q; l/ w8 V. Q2 v( j(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... J- ]# f0 X$ ?% Q: X' m( j
(m) As a young woman who had never given birth before, she couldn't have known what the experience of childbirth would be like...$ e* {" h0 ]* K# N |
(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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