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?
问题描述：
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?
答
第一句用do是因为carrots是复数名词， 第二句用does因为tea是单数名词,同一句话里有助动词does表示三人称单数后面的cost就要用原形cost. 第三句的a movie tiket 是单数名词, 所以回答要用costs,问句里有助动词does所以cost就要用原形cost
答
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