情态动词学习笔记(2) 基本用法：表可能、能力

例句：

 

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例句：

表过去“实际的能力（行动）”例句：

he hurried to the station,and he was able to catch the train
他赶到车站，赶上了火车。
they were able to gt tickets to the huangjiaju concert last week.
上周他们搞到了黄家驹演唱会的票。

 

could还可以表示并不能实现的行为

i'm so tired,i could sleep for a week.(不能用i can sleep for a week)

this is a wonderful place,i could stay here forever.(不现实)