the dictionary costs me 30 yuan为什么用costs呢

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• cost和costs的用法区别什么时候用cost,什么时候用costs?比如说前面修饰的是不可数名词或可数名词时的差别,还有过去式怎么分别?练习书上Sally spent 200 yuan on this new handbag.改后的句子为This new handbag cost Sally 200 yuan.此处用cost是不是因为是过去式呢?如果不是过去式是不是用costs?
• cost和costs的用法the pen me 5 yuan 和 the pen costs me 5 yuan 哪个正确,前者是用了cost的过去式,这支笔花了我五元.这个可以理解,可是为什么还要有后者呢
• Yesterday he bought a dictionary. It c_____ him 50 yuan.到底应该填cost(过去式)还是costs(单三式)呢?不是说客观事实用一般现在时吗？
• the dictionary costs me 30 yuan为什么用costs呢
• 1.My mother does't like doing the housework at home. She usually ____ much timeshopping in the supermarkets. A .spends B .costs C.takes D .pays 2.I bought a dictionary and it _____ me 30yuan. A .paid B.spent C .took D.cost 3. Mum,could you buy me a dress like this? Certainly , we can buy ____ one than this,but ___ this. A.a better,better than B.a worse,as good as C.a cheaper,as good as D.a more important, not as good as 4.How can I
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