他不可能是弄坏你自行车的人——他整晚都和我在一起。

He ___couldn't ___have damaged your bike - he was with me all evening.

那本书上星期不可能在售——它今天才出版！

That book ___couldn't ___have been on sale last week - it's only come out today!

我们都确信那不可能是什么别的东西，一定是鬼魂！

We were all sure that it ___couldn't ___have been anything but a ghost!