通常理解isn&39;t为否定的意思或“不是”。isn&39;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&39;t too difficult once you get the idea.
你一旦弄懂了，就不太难了。
2.&39;That&39;s crazy,&39; I said. &39;Isn&39;t it just?&39; he said.
“那简直是疯了，”我说。“谁说不是呢？”他说。
3.Perhaps he isn&39;t coming.
他许不来了。
4.It&39;s past the appointed time. Maybe he isn&39;t coming.
约定的时间都过了，别是他不来了吧？
5.Isn&39;t that enough for you?
那对你来说不够吗？
