Infinitive - Adverb? Object Noun?

[Seek UP]

Hello.

In this sentence,
Where shall we sit to discuss?
What is the grammatical function of to discuss?

I think to discuss is an adverb that modifies the intransitive verb "sit." A friend (a native speaker) says to discuss is an infinitive noun. What does to discuss modify to function as an infinitive noun? It can't be "sit" because "sit" is an intransitive verb. Am I wrong?
This has been bothering me since yesterday!
Thanks in advance
(This is an excellent site)

[Nicky_K]

Hello.

In this sentence,
Where shall we sit to discuss?
What is the grammatical function of to discuss?

I think to discuss is an adverb that modifies the intransitive verb "sit." A friend (a native speaker) says to discuss is an infinitive noun. What does to discuss modify to function as an infinitive noun? It can't be "sit" because "sit" is an intransitive verb. Am I wrong?
This has been bothering me since yesterday!
Thanks in advance
(This is an excellent site)

I'm not a teacher, not even a student.

Hello!

- to discuss is not an adverb. Adverbs frequently end in -ly. For example: slowly, quietly etc. (But not lonely or smth.)

- to discuss is not an infinitive noun. An infinitive noun answers the question 'what'. For example: I like to discuss. I like (what?) to discuss. In this case to discuss - is the infinitive noun, but not in yours.

I think 'to discuss' is just a verb. When there are two verbs in one sentence the second one must be in infinitive form. It means with 'to' as in vocabulary. 'sit' is a verb, 'discuss' is a verb. Both are in the same sentence. The second one 'discuss' must be in infinitive form. It means 'to discuss' .(except modal verbs).

Grammatical function of 'to discuss' - predicative.

It's just my point of view.