語義上,can/could屬于情態(tài)助動詞,它指主語具備某種“潛在能力”,但并不包含該能力的實施；而be able to屬于半助動詞,它則除了指主語具備某種“能力”外,還往往暗示該能力的付諸實施.針對過去情況時,兩者的區(qū)別意義明顯,不可混用.因為,在過去情況下,主語“潛能”的實施與否,業(yè)已成了定局.比較：
1）We could save his life.
我們有辦法救活他.（但未必實施）
2）We were able to save his life.
我們得以救活他.（付諸實施）
句1）只表示主語有救人的能力,但未必實施；句2）則表示主語非但有救人的能力,而且業(yè)已成功實施了.
how brave he was!he was able to swim across the river in such a bad weather
how brave he was!he was able to swim across the river in such a bad weather
A.could B.was able to C.might D.should
為什么不選A?could不是也有能力的意思嗎?
A.could B.was able to C.might D.should
為什么不選A?could不是也有能力的意思嗎?
英語人氣：639 ℃時間：2019-08-21 07:07:31
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