there were twenty cars in the race?针对twenty做提问
问题描述：
there were twenty cars in the race?针对twenty做提问
答
有20辆车在比赛
答
how many cars are there in the race?
答
对可数名词数量进行提问用how many
How many cars were there in the race?
答
how many cars were there in the race?
答
How many cars are there in the race?
答
How many cars were there in the race?