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 ! v1 B+ S3 ]. M2 M
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我个人觉得这两种说法都可以。
/ H2 `% Z3 v L1. Couldn't do有表示past impossibility的用法。9 c( ^. ]/ A5 b
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).
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pearsonlongman.com也对couldn't have done的用法作了一番解释。. \, M# x9 {& ~7 G( y0 {
1. Couldn't have expresses past impossibility of an idea being true. , }; c o! S! r/ N) z/ G1 w
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: `6 f+ B8 c! q
3. Non-conditional uses of couldn't have abound. It occurs to express impossibility in past time narratives or commentary.
4 Q! ]9 Z. h( `: F0 @* ]% g+ t4 C5 L/ `4. With actions that take some ability or skill, it means didn't have the ability or skill to." J9 p( {1 X5 O2 b$ D
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! k: D8 f2 u* H7 H) M: ~( M0 Y针对第三点给出的例句：
' A8 s4 D' F6 }# h! `2 Z(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...% D; a7 R' i; w# C
(m) As a young woman who had never given birth before, she couldn't have known what the experience of childbirth would be like...
; S2 J9 N5 t) `2 ], @(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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