doesnt和isnt用在句中的用法

doesn't 和 isn't 是 does 和 is 的否定词（或反义词），因此 doesn't / isn't 的用法和 does / is 一样， 也就是He/she/itdoesn't 表达动作，即 他/她/它 "做" 或“操作” 某某事，通常接动词。

例：He doesn't go sailing anymore， ever since his boating accident.

译：自从出事以来，他再也不去航海了。

例：He isn't a carefree person that he used to be， ever since the mishap.

译：自从那次灾难以来，他并不像以前那样无忧无虑。

isn't和doesn't的用法一样，都常用于否定句。在很多情况下，两者可以互换。

如：But he is not reading his newspaper tonight.

这里的is not可以用doesn't代替，表达的意思都是但他今晚不看报纸。

词汇解析：

isn't：不是的

发音：英 [ˈɪznt] 美 [ˈɪznt]

is not 的常用口语形式

例：It isn't too difficult once you get the idea.

译：你一旦弄懂了，就不太难了。

doesn't：不是的不

发音：英 [ˈdʌznt] 美 [ˈdʌznt]

does not 的常用口语形式

例：It doesn't matter to me whether you go or not.

译：你去或不去，对我都没关系。