What have we here? - go in

[Eagle]

Hello
I have some doubts about the use of these verbs: have and go in. I'd like you to explain me why they're used differently:
~ For example, John and Lisa are dressed up. They're going to go out at night. Lisa's mother looked at them, surprised. Then she said:
Oh, my! What have we here?
Is this an special case of using the verb "have"? Why didn't Lisa's mother used the auxiliar do?

~ In this other example. "A" says to "B": Let's go in the kitchen.
Here, I think go into should be instead of go in, because "A" and "B" were entering the kitchen. Why does ''A'' use go in instead of go into?

Well, thank you so very much in advance for helping me and for your time.

[Alan]

Hi Eagle,

What have we here? expresses surprise at what you can see. I agree I think when you have an object, go into the kitchen is better.

Alan
_________________
English as a Second Language
You can read my ESL story Present Simple

[Eagle]

Hi Alan,

Thank you for your help.

One question: What do you mean by:

when you have an object, go into the kitchen is better.

I consider "A" and "B" as people.

Thanks

Eagle

[Alan]

Hi Eagle,

Sorry, I didn't make myself clear - I meant an object after the preposition. So you would say: Please go in (no object) but Please go into the kitchen (object).

Alan
_________________
English as a Foreign Language
You can read my EFL story Progressive Forms

[Eagle]

Thanks for clarifying, Alan.