有没有人说i had have lunch 或者是 i have have lunch

为什么有人说I have had lunch?It is because it is a common correct expression.
却不说i had have lunch 或者 i have have lunch 因为是错误的.It is because they are wrong and not acceptable.
English is not as flexible as Chinese.
我吃过饭了.
=饭我吃过了.=饭,我吃过了
=吃过饭了,我.
But you cannot say:饭吃我过了,or 饭吃过我了.为什么却不这样说?It is because it is wrong.No one say so!因为是错误的.
然后 i had had lunch 和 I have had lunch 有什么区别吗?
Yes.There are differences.
I had had lunch.It is used in the past time.The good example is if the person is already dead,the sentence he said when he lived,I have had lunch should be :He said he had had lunch.
I have had lunch.Means you have just finished your meal and you are not hungry any more.