Tjis isn't Jane's eraser._________is white

This isn't Jane's eraser. ( )is white. 根 Is it a eraser,Jane? No,it isn,t.哪里出现了错误? It's her eraser 改为否定句 It‘s isn’t eraser 为什么用isn‘t 而不用not 填空sam:what's this it's an eraser.but it isn't my eraser.hi,j It isn't a c_______photo.It’s black and white. Is this eraser yours or Jane's? 单项选择（ ）21.It isn’t ______ ring.It’s ________ eraser.A.an,an She’s Jane.Is he Jack?No,he isn’t,His name’s Mike. Hello!May I speak to jane ,please.Sorry ,she isn't in,Who's It's white.It's ____ ____ white_______ No,it isn' t.____quil ___No,she isn' t . H___name is jane 连词成句 isn't,it,eraser,her