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。3 ]2 S4 q* ? |8 L
1. Couldn't do有表示past impossibility的用法。
/ o" Y5 T, i# x. ?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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6 L9 B9 N" J3 |2 Ipearsonlongman.com也对couldn't have done的用法作了一番解释。
3 t! Y1 H4 y# |# I0 X- G4 W1. Couldn't have expresses past impossibility of an idea being true. ) J3 [, l8 W* p4 ~* R% d
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.
8 ?2 {2 r8 j1 s7 y3. Non-conditional uses of couldn't have abound. It occurs to express impossibility in past time narratives or commentary.
1 e, }6 f, i% e4. With actions that take some ability or skill, it means didn't have the ability or skill to.6 o( e5 h( s, m1 j! [
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: @5 n' k7 }% M1 g9 a) x; y针对第三点给出的例句：3 X- v' T' P7 ^8 I+ I' T( Z+ L/ p6 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...- G7 V$ M! x- j* M2 O
(m) As a young woman who had never given birth before, she couldn't have known what the experience of childbirth would be like...
9 r5 ?- m9 y8 w8 t Q. x(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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