Pronounce 'going' + ing

[mvdberg112]

How to pronounce:
We're going diving.

Explanation:
We're going to make a tour.
'going to' can be pronounced as going to /gəʊɪŋtə/ or as gonna /gʌnə/:
However,
We're going diving.
If I pronounce 'going' as gonna /gʌnə/ then the sentence becomes:
I'm gʌnə dive.

Is this correct English?
Is this indeed common in spoken native English?

Thank you!

[5jj]

We're going diving.
If I pronounce 'going' as gonna /gʌnə/ then the sentence becomes: I'm gʌnə dive.
No, you would be saying /gʌnə/ diving.

Is this correct English? No
Is this indeed common in spoken native English? No

In we're going ....ing, going is pronounced /gəʊɪŋ/