they’re my brother.(改为否定句)
THEY 'RE CATS(改为否定句)
they are my brother变成否定句
That`s my brother.改为否定句
this is my brother 改为否定句
My brother likes tennis. 改为否定句
That is my brother.改为否定句
They are my boxes 改为否定句
they are my aunts.改为否定句
They were my friends 改为否定句
they`re on the chair.改为否定句
They're playing the giter.改为否定句
they're going to fly kites tomorrow 改为否定句