be able to和could

来源：学生作业帮编辑：灵鹊做题网作业帮分类：英语作业时间：2024/06/11 19:59:55

be able to和could
表示过去实际上可以做到的事时只用was/were able to不用could
那这个怎么解释I was able to speak English中的 was able to 可以换成could
求精简的解释,注意针对问题回答

一般泛泛地讲“某人过去能做什么”,用could
你的那个句子还是用could 较好
I could speak English
具体某一次做成什么,用was able to
如：
Two hours later,he was able to swim across the river.
否定句中可以互换
He was so drunk that he couldn't/ wasn't able to find the door.

be able to和could could和be able to的区别 can could be able to be able to 和could/can 有什么分别 can,could和be able to的区别 be able to、can、could的区别 be able to和can could 和was able to 的区别? would be able to和be able to的区别 be able to 和will be able to 的区别 can/could和be able to在这两个句子里的区别,为什么不能替换 Could 和 Be able to 各用在什么情况下,两者有什么不同?