54: 什么时候用“ain't”这个词比较合适?

Question 54: Thanks to internet, I've got chances to talk with English native speakers online. I found that they often use the word "ain't" while I've never encountered this word in any of my text book. I'm wondering when it is proper to use ain't in a sentence.

Answer: Ain't isn't a recognized contraction! It's never correct to use it in written English although you may hear it in informal spoken English in some parts of the English speaking world.

The correct contraction is "isn't" for "is not".

问：有了internet以后，我可以在网上和说英语的国家的人聊天了。我发现他们经常使用“ain't”这个词，而我却从来没有在我们的课本上看到过这个词。我想知道什么时候用“ain't”这个词比较合适。

答：ain't 并不是一个被认可的缩写。虽然你经常可以听到一些英语国家的人在非正式的场合使用它，但在书面语里，这绝对是个错误的用法。
正确的缩写应该是“isn't”，表示“is not”。