they're expensive knives.改为单数句
they're expensive knives.改为单数句
They are expensive knives.(改为单数)It's ______ _____ _____.
They have some knives.改为单数
They‘re eggs 改为单数句
They're good policewomen.(改为单数形式)
They're English books.改为单数形式
They're my uncles.改为单数形式.
They're American boys.(改为单数)
what are they doing?They 're play with yo-yos改为单数句
This is my new backpack.改为复数句 They're my aunts.改为单数句 Those a
They're my cousin.(改为单数形式)
THEY 'RE CATS(改为否定句)