isn't

英 [ˈɪznt]

美 [ˈɪznt]

is not 的常用口语形式

Collins.5

柯林斯词典

What is it then? Something's up, isn't it?
那是怎么回事呢？出问题了，是吗？
Awfully hot, isn't it?
非常热，是不是？
It's a devil of a tricky problem, isn't it?
这是个非常棘手的问题，不是吗？
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。
She's quite pretty, isn't she?
她长得挺美，不是吗？
Merely because you believe a thing is right, it isn't automatically so
事情不会仅仅因为你相信它是对的，就会必然如此。
Isn't that enough for you?
那对你来说不够吗？
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？
Mummy is so nasty to me when Daddy isn't here.
爸爸不在这儿时，妈妈对我很凶。
This isn't the first hare-brained scheme he's had.
这已经不是他制定的第一个愚蠢方案了。