he could hum songs when he was eight years old.这句话为什么要用could,而不是can那不就可以理解为
他以前会哼歌,
人气:266 ℃ 时间:2020-05-14 08:49:01
解答
could某些时候可以当成can的过去式
不是以前会现在不会只是在强调在他八岁的那个时间点开始会唱了
就好比说 he could ski when he was three一样 只是在强调那个过去的时间点过去式不是发生在过去,结束在过去吗?是, 但是还有个前提是有过去具体的时间点比如 three days agolast weeki went to paris last summeri have been to paris如果时间不明确 发生在过去就用现在完成时了
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