對過去發(fā)生的事情作出與事實相反的推論,條件句用had + -ed,主句用should/ could /would have + -ed.
should/ could /would have + -ed可以表示“本來可以.,但是不是那樣發(fā)生的,與事實相反;或者：“應(yīng)該/可能已經(jīng)...”,表示推測,不一定與事實不符.
所謂動詞原形或者不定式,其實也有多種形式：do (不能用did,does）； have done （不能用had,has）；be done （被動）； be doing進(jìn)行（當(dāng)然不能用am ,is are,was ,were); have been doing (完成進(jìn)行)
If the captain had been more careful,he could have prevented the accident.提問!
If the captain had been more careful,he could have prevented the accident.提問!
If the captain had been more careful,he could have prevented the accident.
這句的后半句,有情態(tài)動詞和現(xiàn)在完成時,有這種表述么?
不是手情態(tài)動詞后面的動詞用圓形么?為啥還能有時態(tài)的的變化?
If the captain had been more careful,he could have prevented the accident.
這句的后半句,有情態(tài)動詞和現(xiàn)在完成時,有這種表述么?
不是手情態(tài)動詞后面的動詞用圓形么?為啥還能有時態(tài)的的變化?
英語人氣：431 ℃時間：2020-04-15 12:36:59
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