could

By the time she was eight, she could read Greek and Latin.

她八岁时就会读希腊文和拉丁文了。

In those days you could buy a box of cigars for a dollar.

那时候，一美元能买一盒雪茄烟。

Could you hear what I was saying?

你能听到我说的话吗？

I couldn’t get tickets after all, they were sold out.

我最终还是没能弄到票，全都卖完了。

I knew I couldn’t afford the rent.

我知道我付不起租金。

The teacher said we could all go home.

老师说我们都可以回家了。