Question

what does your father have for lunch?

for lunch已经是吃午饭了 为什么还要用have

Answer 1

for lunch 的意思不是＂已经是吃午饭了＂，直译是：为了午餐，作为午饭。What does your father have for lunch? 直译：你父亲用什么作为午餐？意译：你父亲午餐吃什么？

从语法上看，for lunch 是介词短语，不可以作句子的谓语，have（吃）才是动词，可以作谓语。

Answer 2

楼主所问的what does your father have for lunch?中，have是谓语，for lunch是状语。一句话必须有谓语。

Answer 3

What does your father have for lunch?

你爸爸午餐吃什么？

have 是谓语动词

Answer 4

请问句子的原意为何？
Have your father lunch?
Do your father have lunch?
What does your father in lunch?