How did he become an actor?这句中become为什么不是became?

How did he become an actor?这句中become为什么不是became? 不是过去时吗 为什么是become 不是 became? George didn't study art.____ he decided to become an actor A .George didn’t study law.____ ,he decided to become an actor 为什么是have become 而不是have became? 英语翻译became可以改成become吗?为什么? His father wants him_____(become )an actor.怎么填 英语作文If I become an actor,60词左右. His ambition is _ an actor.A.becoming B.become C.to become D I hope to become an actor=___ ___is to be an actor 为何下句中的become不是用became ①when did the singer first become famous ②How an