It isn't my pencilcase,but this is my backpack是什么意思?

it's not my...和 it isn’t my. This isn't my shirt.It's_________(you) The pencil isn’t m___,it's my sister no,it isn't isn't it nice say it isn`t It isn't my cap Whose cap is it,____(那么)?It's heIt isn't my capWhose cap is it,____(那么)?It's hers It's not my fault可不可以改成It isn't my fault? it isn't my shirt 与it's not my shirt有什么不同 mother your my aunt is 连词成句 isn't it my friend连词成句 this is not my ... 和 it isn‘t my ... 有什么区别么? It isn't my pencilcase,but this is my backpack是什么意思? isn't,is,your,my,aunt,mother,no,that,it,it's.连词组句 nothing is wrong with my watch,_______ 用is it 还是 isn't it This is my ruler.(改为同义句）No,it isn't.It's________ 初一英语单数句子变复数句子① IS this you aunt?—Yes,it is./NO,it isn't.This isn't my aunt.② It is a book.Is it a book?It isn't a book。③ He is my father。Is he your father?—Yes,he is./No he isn't.He isn't my father.⑤ This dic 英语翻译Isn't it dangetous a isn't ball it