isn't

英 [ˈɪznt]

美 [ˈɪznt]

is not 的常用口语形式

Collins.5

柯林斯词典

It's a devil of a tricky problem, isn't it?
这是个非常棘手的问题，不是吗？
Mummy is so nasty to me when Daddy isn't here.
爸爸不在这儿时，妈妈对我很凶。
My law practice isn't the most important thing in my life, you know.
你知道，我的律师事务所不是我生活里最重要的事情。
This isn't highfalutin art-about-art. It's marvellous and adventurous stuff.
这不是一件纯粹为艺术而艺术的华而不实的东西，而是进行了大胆创新的非凡作品。
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？
Perhaps he isn't coming.
他许不来了。
There! Isn't that your umbrella?
喏，这不就是你的那把雨伞？
He just isn't in your league.
他和你根本不是同类型的人。
Isn't that enough for you?
那对你来说不够吗？
She's quite pretty, isn't she?
她长得挺美，不是吗？