this is my sister' room改为否定句
This is my sister's room改为否定句
this is my sister' room改为否定句
This is my room 改为否定句
My sister is in the room(改为否定句)
she is my sister.改为否定句.
She is my sister.改为否定句
They are my uncles.改为否定句 This is not my sister.缩句
This is my sister 改为复数句
This is my sister.改为一般疑问句并做肯定回答 That's my brother改为否定句
This is my ruler (改为否定句)
this is my friend.(改为否定句)
this is my brother 改为否定句