he could hum songs when he was eight years old.这句话为什么要用could

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,

转运风车 1年前已收到1个回答举报

漫天飞雪1008 幼苗

共回答了11个问题采纳率：81.8% 举报

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

1年前追问

转运风车举报

过去式不是发生在过去，结束在过去吗?

举报漫天飞雪1008

是，但是还有个前提是有过去具体的时间点比如 three days ago last week i went to paris last summer i 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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你能帮帮他们吗

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