关于could和be able tocould 和 be able to 都可用在一般过去时的句子里,那有什么区别吗?

could和be able to的区别 关于英语词组的用法be able to和could有什么区别? 关于could和be able tocould 和 be able to 都可用在一般过去时的句子里,那有什么区别吗? be able to 和could/can 有什么分别 can,could和be able to的区别 can could be able to be able to、can、could的区别 could和was able to和manage to有什么区别?could，be able to，manage都表示已经做成某事？ Could 和 Be able to 各用在什么情况下,两者有什么不同? could 和was able to 的区别? 关于 英语中could的用法 谢谢了You could get =you would be able to getYou could speak=you were able to speak请问这两句有什么区别?多谢! be able to 和will be able to 的区别 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 关于 be able 我看语法书上写的be able to表示成功的做成某事,不能用could.而新概念2册的62课 Firemen had been fighting the forest fire for nearly three weeks before they could get it under control.这里为什么不用be able be able to 和 able to的区别 请教新概念英语4上的一个填空题,关于CAN 和BE ABLE TO 的用法.he ____easily swim across this river if he wanted to(could) amundsen ____reach the south pole before Scott(was able to)i rang up several times before i ____contact him(was 请教新概念英语4上的一个填空题,关于CAN 和BE ABLE TO 的用法.he ____easily swim across this river if he wanted to(could) amundsen ____reach the south pole before Scott(was able to)i rang up several times before i ____contact him(was 谁能告诉我关于can,could,be able to的区别呢?能举个例子吗?就是哪个表示先天的能力,哪个表示后天的能力?