I'm the one who... We use this expression to specify that I am the person who is special in some way. 我们用这个表达来强调，我们在某方面的独特作用，区别于他人。 A: If we take this bag to the police, perhaps they'll give us a reward. 如果我们把这个包交给警察，兴许他们还会奖励我们。 B: I'm the one who should have a reward, because I'm the one who found the bag. 我才是那个该得到奖励的人，因为我是哪个找到这个包的人。