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。
6 n1 O3 {8 k% D( ~: k& D1. Couldn't do有表示past impossibility的用法。
8 |! l; G3 d+ O- q6 F: O2. 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). ) h$ Y+ m% o+ w/ n \
2 L8 t8 M$ o3 w/ {pearsonlongman.com也对couldn't have done的用法作了一番解释。
! t' L) _ g" T" r, S4 b1. Couldn't have expresses past impossibility of an idea being true. ( ^" y p0 b& d4 f4 C3 k) `
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.
+ X) ~$ ^" t8 G4 ]. u9 t" C7 J3. Non-conditional uses of couldn't have abound. It occurs to express impossibility in past time narratives or commentary.* n9 `& w0 M+ _$ i2 t) C- m
4. With actions that take some ability or skill, it means didn't have the ability or skill to.0 j: G9 \8 k; x4 i. f1 b
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" P! K( S2 {9 F/ C针对第三点给出的例句：# W0 d4 C3 s% K( |* M, V9 L( |
(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...% N" d3 Y0 H6 p. d: Q2 v
(m) As a young woman who had never given birth before, she couldn't have known what the experience of childbirth would be like...
& X& V" t8 U" F(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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