He didn't use to answer impolitely.

他过去回答别人总是很有礼貌的。

Let me know if they treat you impolitely.

如果他们对待你不礼貌，请告诉我。

We should not speak to the elderly impolitely.

我们不应该没有礼貌地对老年人说话。

They begin to dislike tourists and to treat them impolitely.

他们开始不喜欢游客，也不再会有礼貌地对待他们。

Furthermore , he speaks too impolitely. He should speak more politely.

还有，他说话没礼貌，他应该礼貌地说话。