重点讲解：
1. be good for
善于做；精通于；
eg. Joe was always good for a colorful quote.
乔总能绘声绘色地旁征博引。
eg. She heard her father shouting that her mother was stupid, useless, and good for nothing but her money.
她听到父亲叫嚷说母亲愚蠢无能，除了有点钱外一无是处。
2. out of
从（某处）离开；
eg. She let him out of the house.
她让他出了屋子。
eg. Don't worry. We'll have you out of here double-quick.
别担心，我们会很快把你从这儿弄出去的。
3. be supposed to do sth.
（按计划或期望）应当，应该，须；
eg. Whatever the circumstances, parents are supposed to know what to do for the best.
不论在什么情况下，父母都应该知道怎样做才是最好的。
eg. You are not supposed to gull your friends.
你不应该欺骗你的朋友。