can not后面加什么

　　You can not play table tennis by yourself.

　　你不能独自一个人打乒乓球。

　　I have to inform you that we can not approve of it.

　　我不得不告诉你，我们不能批准它。

　　The sweet potato in the village is what I can not forget.

　　山村的地瓜是我不能忘怀的。