though he is a boy 改成 倒装句 boy as he is 为什么要把a去掉 什么规则?具体说说

He is as a good boy as Tim.为什么要用as a good boy as? Maybe he is a boy (改成同义句） He is as a tall boy as he is. He is a ( )boy He is a boy? He is a boy 改成同义句what a lucky boy he is （ ）（ ）the boy is! 初三英语选择,急!Though Jack is a boy,he write _____I doA as careful He is as tall a boy as his brother.这句中的as tall a boy as不理解 He is a boy 改为否定句 boy he a is连词成句 He is a boy改否定句