This is my ruler (改为否定句)
This is my ruler (改为否定句)
Is this ruler?(改为否定句)
This is his ruler.(改为否定句)
this is my ruler改成否定句
This is my ruler 的否定句
[紧急求助]This is a ruler.改为否定句
This is his ruler.改为否定句.是不是This is not his ruler.
This is my room 改为否定句
this is my friend.(改为否定句)
this is my brother 改为否定句
This is my father()改为否定句
This is my grandmorther.改为否定句