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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5 Y5 w7 @" w& v+ ]) c3 x/ x我个人觉得这两种说法都可以。4 Z% t0 d: v+ F" S' x0 H/ }* p
1. Couldn't do有表示past impossibility的用法。% [% W* j1 I! k. s& @
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). / O- H' v/ Z1 \
. H8 f7 z4 ^" K7 A1 _# ]pearsonlongman.com也对couldn't have done的用法作了一番解释。
2 Y+ D1 e) m# Y) [+ A e1. Couldn't have expresses past impossibility of an idea being true.
, g' S+ }% j$ H, _- K! M" h2. 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 ~2 m8 b8 ?5 K& `4 ]& S3. Non-conditional uses of couldn't have abound. It occurs to express impossibility in past time narratives or commentary.
* F$ I4 Z' V6 J: i2 i4. With actions that take some ability or skill, it means didn't have the ability or skill to.) a% P+ H0 q3 l
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+ W4 I, s' w. ~. D% n针对第三点给出的例句：# Y9 a( U6 s* z4 x! i! A
(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! ?4 v8 t# q2 U
(m) As a young woman who had never given birth before, she couldn't have known what the experience of childbirth would be like...
, P! {9 l8 O/ e/ c! K" r(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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