isn't

剑桥词典

short form of is not
（is not的縮略形式）
He isn't coming until tomorrow . 他到明天才能來。

例句

• It isn't easy being a parent .
• "Is there any more soup ?" "No, I'm afraid there isn't any left ."
• He's getting old and his hearing isn't very good.
• It's rather cold today, isn't it?
• Leave daddy's camera alone - it isn't a toy !
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