通常理解isn"t为否定的意思或“不是”。isn"t=is not，是is not的用法和缩写经常用在反义疑问句里，反义疑问句起强调作用，没有不礼貌的问题。

双语例句

1.It isn"t too difficult once you get the idea.

你一旦弄懂了，就不太难了。

2."That"s crazy," I said. "Isn"t it just?" he said.

“那简直是疯了，”我说。“谁说不是呢？”他说。

3.Perhaps he isn"t coming.

他许不来了。

4.It"s past the appointed time. Maybe he isn"t coming.

约定的时间都过了，别是他不来了吧？

5.Isn"t that enough for you?

那对你来说不够吗？