when is his birthday? 句子开头为什么不用what?

问题描述:

when is his birthday? 句子开头为什么不用what?

可以用what 但是句子就是:what time is his birthday?或者:what day is his birthday?
这里是问时间
希望有帮到你:)

Birthday指时间,表示“出生的日子”,所以用时间疑问词“when”而不是

生日为具体年月日,用when提问
what对东西提问,不能用