语义上,can/could属于情态助动词,它指主语具备某种“潜在能力”,但并不包含该能力的实施;而be able to属于半助动词,它则除了指主语具备某种“能力”外,还往往暗示该能力的付诸实施.针对过去情况时,两者的区别意义明显,不可混用.因为,在过去情况下,主语“潜能”的实施与否,业已成了定局.比较:
1)We could save his life.
我们有办法救活他.(但未必实施)
2)We were able to save his life.
我们得以救活他.(付诸实施)
句1)只表示主语有救人的能力,但未必实施;句2)则表示主语非但有救人的能力,而且业已成功实施了.
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
为什么不选A?could不是也有能力的意思吗?
A.could B.was able to C.might D.should
为什么不选A?could不是也有能力的意思吗?
英语人气:230 ℃时间:2019-08-21 07:07:31
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