"I want to be an actor"中为什么要用be而不是is?

I want to be an engineer. I like drawing pictures .I want to be an ___. I want to be a/an英语作文80词 英语作文 I want to be an inventor I want to be an actor是什么时态 i want to be an engineer.哪个是动词 I want to be(an actor)对括号内提问 I want to be an angel in white I want to be an architect （改为同义句） I want to be I want to be Our teachers want all of us to be ___(act) in all the classroom____(act). linda likes () (act),she wants to be an () (act)应怎么填呢? i want to be an actor because I like acting改错第一个i改为I i want to be an actor为什么要加to be I want to be an actor.(保持原句意思基本不变）I ______ ______ to be an actor. what are you want to be I want to be an actor.找出一个错误谢谢请找出一个错误. I want to be both an artist and an engineer.怎样译这个句子