必須跟復數。how many后面的名詞及謂語動詞都要用復數，它是修飾可數名詞的。句式：How many+復數名詞+一般疑問句。

howmany+可數名詞復數形式

How many books do you have?

你有多少本書？

How many children are playing in the park?

有多少位孩子在公園里玩？

How many cats are in the shop?

商店里有多少只貓？

How many cars are blue?

有多少輛車是藍色的?

How many apples are put in the fridge?

有多少只蘋果被放在冰箱里面。

所以，請一定要記住howmany后面跟復數名詞。

how many雙語例句

How many candidates are standing for election?

有多少候選人參加競選？

How many people were there?

有多少人？

How many days did you take off?

你休了幾天假？

How many children do you have?

你有幾個孩子？