1. 当然不可以.believable是个形容词(可信的,可以相信的),如果是动词才可以那样说.2. believable既然是个形容词,那它一般可以修饰名词做定语,如: She is a believable girl;或者放在系动词之后做表语,如: I think the story is believable.或者做补足语,如: Do you think him believable?