we are cleaning the library (改为否定句)
we are cleaning the library (改为否定句)
We are cleaning the room now改为否定句
They are studying in the library.(改为否定句)
We have done some cleaning already.改为否定句
The students are reading some books in the library.改为否定句
Tom is cleaning the ciassroom.改为否定句
the students are cleaning the classroom 否定句
we are in the same class.改为否定句
we are in the same grade (改为否定句)
we are from America.改为否定句.、 、
we are from china 改为否定句
Is the library on Fifth Avenue.改为否定句