They are my uncles.改为否定句 This is not my sister.缩句

They are my uncles.改为否定句 This is not my sister.缩句 把They are my uncles.改为否定句 they are my uncles 改否定句 they are my uncles改为否定形式 This is my sister's room改为否定句 this is my sister' room改为否定句 she is my sister.改为否定句. She is my sister.改为否定句 This is my sister 改为复数句 They are my boxes 改为否定句 they are my aunts.改为否定句 This is my ruler (改为否定句)