1、Why do you have to...? 你为什么要……？ “Why do you …..?”的问法有点质问的语气，加一个“have to”就缓和了这种语气，因为“have to”表示“不得不”，听起来已经是为对方找了点理由。 A: Why do you have to tell her the truth? B: Because she always finds out the truth anyway! A: 你为什么要告诉她？ B: 因为不管怎么样，她总能发现事情的真相。 A: Why do you have to leave so early? B: I have an early appointment tomorrow morning. A: 你为什么要这么早走呢？ B: 明天一大早我有个约会。2、（1）他的脸上绽开了满意的笑容。His face expanded with a satisfied smile.（2）他并没有听懂我言下之意。he didn't catch the undertone of my words.（3）只有他们能够编造出那样稀奇古怪的故事。It was they who could come up with such wild stories.（4）他经常从后门溜出去打麻将。He often slipped out of the rear door to play mahjong.（5）乞丐挣扎在饿死的边缘已经好几天了。The beggar has struggled on the verge of starvation for severaldays.