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5.It took me half an hour to do homework yesterday.(同义句转换)
Ispent half an hourdoing homework yesterday.

分析 昨天我花了半小时做家庭作业.

解答 答案:spent; doing.结合句意是表示花时间做某事,结合主语是人I,故用spend+时间+doing sth,这里是一般过去时,spend的过去式是spent,故答案是spent; doing.

点评 spend,cost,take和pay的区别是历年中考试题的必考内容之一,虽然它们都可以表示"花费",但用法却不尽相同.spend的主语必须是人,常用于以下结构:(1)spend time/money on sth.在…上花费时间(金钱).(2)spend time/money (in) doing sth.花费时间(金钱)做某事.cost的主语是物或某种活动,还可以表示"值",常见用法如下:(1)sth.costs (sb.)+金钱,某物花了(某人)多少钱.(2)(doing) sth.costs (sb.)+时间,某物(做某事)花了(某人)多少时间.take后面常跟双宾语,It takes sb.+时间+to do sth.做某事花了某人多少时间.pay的基本用法是:(1)pay (sb.) money for sth.付钱(给某人)买….(2)pay for sth.付…的钱.(3)pay for sb.替某人付钱

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