（3）I want to know how many English words you have learned．
我想知道你们已经学了多少英语单词了。
（4）She asked how much it cost．她问它值多少钱。
4. Whats the number of the Smiths flight out of Beijing?
史密斯全家离开北京的飞机航班号是什么？
（1）flight是fly的名词形式，表示飞行；航班等。
例：Flight Number 6141 to Beijing is ready to leave.
去北京的6141次航班马上就要起飞了。
（2）out of从……出来（去），相对的词为into。
如：come out of the room 从房间里出来。
go into the room 到房间里去。
5. take, spend, pay, cost
四个单词意思均为花费，使用。
take常用于It takes（took，will take）sb sometime to do sth；spend构成的句式中，一般以人做主语，句型为：spend…on sth或者spend… (in)doing sth；pay构成的句式中，一般以人作主语，常用句型为 pay sb for sth 为……付款给……，pay off…付完，偿清……；cost一般以物做主语，可以解释为花费；价值，它还可做名词，意思是价值，价格。
It took my uncle less than two weeks to plant the trees. But its worthwhile. You see, we paid nothing for all these trees, though they cost us more time and more energy. We spent almost 10 days last month searching everywhere, hunting for a farmer who is willing to off
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