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do does ; cost costs的用法!

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do does ; cost costs的用法!
1:how much do the carrots cost?
the carrots cost three dollars.
2:how much does the tea cost?
the tea costs two euros.
3:how much does a movie ticket cost?
a movie ticket costs nine pounds.
问:为什么第一句用do,第二句用does呢?为什么第二句和第三句回答中不用cost,而是用costs呢?
第一句里的carrots是复数啊``当然用DO``
tea是不可数名词``所以用costs
ticket是可数名词单数``所以用costs