could

can 的过去式
conj. 能够

I can't sing now, but I could when I was young.

现在我不会唱歌了，但我年轻的时候会。

I wish we could see more new programmes on television, not repeats all the time.

我真希望我们能够看到更多新的电视节目，而不是翻来覆去的那几个老节目。