1、pay off, cast down精析1. pay off 还清，付清工资后解雇，取得成功，得到好结果。如：Her debts were not fully paid off until last year. 直到去年她才还清了债。When the building was completed, he paid off the workers. 这幢楼建成后，他就辞退了工人。Did your plan pay off? 你的计划成功了吗？All their hard work has paid off! The house is finished at last. 他们辛勤的努力得到了回报！
2、房子终于建成了。【拓展】 1) pay back 还钱，报复。如：Ill pay back the money you lent me next week. 下星期我把你借给我的钱还给你。Will you lend me 5? I will pay you back next month. 借给我五英镑好吗？我下个月还你。One day Ill pay back that boy who broke my bike! 总有一天我得报复一下弄坏我自行车的那个男孩！2) pay for 付钱，支付，付出代价。如：How much did you pay for that book? 你买那本书花了
3、多少钱？He will have to pay for this foolish behaviour. 他将因这种愚蠢的行为而付出代价。2. cast down使失败，使沮丧（常用be cast down）， 丢下，扔下，使向下。如：The proud will be cast down. 骄者必败。Dont let yourself be cast down by a small failure in the experiment; try again. 别为了实验中一次小小的失败而垂头丧气，再试一次。The enemy cast down their weapons and gave in
4、. 敌人丢掉武器投降了。【拓展】 1) cast a glance at 看一眼。如： I just cast a glance at the headlines. 我只是看了看标题。2) cast sb into prison 把某人投进监狱。如：The thief was cast into prison one year ago. 一年前这个小偷被投进监狱。3) cast away 扔掉，浪费。如：Dont cast away these old papers; they might come in useful. 别丢掉这些旧报纸，它们也许会有用。He casts away much of his time. 他浪费了许多时间。4) cast up 把加起来。如：With practice, she can get to cast up figures very rapidly. 通过练习，她能把数字熟练地加起来。
