They're my cousin.(改为单数形式）

They're my cousin.(改为单数形式） They're my uncles.改为单数形式. They're good policewomen.(改为单数形式) They're English books.改为单数形式 they're my sisters 变单数形式 They aren;t my grandparents.（改为单数形式） they’re interneting movies （变单数形式） 按要求完成句子.1、 They're English books.(改为单数形式）2、 Those are ___bla They're old watches. 改成单数形式? They're too big的单数形式 They‘re eggs 改为单数句 they're expensive knives.改为单数句