重点讲解：
1. point to
指向；朝向；
eg. You can go anywhere and still the compass points north or south.
无论走到哪里，罗盘仍然指向北或南。
eg. He controlled the car until it was pointing forwards again.
他稳住车子，直到它又朝前开去。
2. come upon
偶然碰到（或发现）；产生（某种态度或感觉）；
eg. I came upon an irresistible item at a yard sale.
在一次庭院拍卖会上，我偶然发现了一个忍不住想买的东西。
eg. A sense of impending doom came upon all of us.
我们所有人都有一种大难临头的感觉。
3. have sb. doing sth.
是指让某人一直做某事，强调动作的持续性、连续性或者动作的反复性；
eg. He had us laughing during the lunchtime.
他让我们在午饭期间一直笑个不停。
eg. You’d better have your car running slowly.
你最好把车子开慢点。
4. tell sb. to do sth.
叫；命令；吩咐；建议某人做某事；
eg. A passer-by told the driver to move his car so that it was not causing an obstruction.
一个过路人叫那个司机把他的车挪一挪，免得挡道。
eg. She told me on the telephone to come help clean the house.
她在电话里叫我过去帮忙打扫屋子。
5. haven't a clue
不知道；一无所知；
eg. I haven't a clue what I'll give Carl for his birthday next year.
我不知道明年卡尔过生日我该送什么。
eg. Children today haven't a clue about nature.
今天的孩子对自然没有一点印象。