王维嘉的回答：

How many days are there in May? 

冰雪迎馨的回答：

How many days of may？

希希的回答：

How many days are there inMay?

shall we talk的回答：

你好‘爱英语团队’给你的解答是：Do you know how many days are there in may?

勇闯天涯的回答：

How many days in May?   day是不可数名词，用are 都是错的！分不清可数不可数就别写Iis there\are there 了