NOTE1: 注意as的弱读，还有green as得连读；
NOTE2: It means that he is still childish. 2） It'll be possible when pigs fly.
NOTE1: 注意possible的发音要领；
NOTE2: It means that it is impossible at all. 「世博ＶＯＡ」洗耳恭听，两个句子小菜一碟！ Here is a dialogue between the husband and wife: -Your company is becoming bigger and bigger.
-Yeah, but I am worrying about it.
-So what is it?
-I am wondering who will take my place when I am old.
-Don't know that we have a son?
-Of course, I know, but he has not talent for business at all.
-So you don't want to hand down your business to him?
-Surely not. He is still as green as grass.
-But I think you can teach him how.
-Do you think he can learn? It'll be possible when pigs fly. 1） He is as green as grass. 他比较幼稚。
2） It'll be possible when pigs fly. 这绝对不可能。 「请你猜猜看」挑战自我，情景抢答也刺激！ Here are three situations: S1. Do you think it is possible that an athlete can run at the speed of 20 meters per second? S2. He thinks that a college student can find a good job right after their graduation. What do you think of his idea? S3. A piece of news says that he can live for a month without drinking and eating anything. Do you believe? Is it possible?