Question

3.Will or going to?
I/ lend you mine. I don't need oi on Friday.
Oh,thank you, I / buy the petrol.

Answer 1

I going to lend you mine.I don't need on Friday.Oh, thank you, I going the petrol

Answer 2

I going to lend you mine. I don't need oi on Friday.
Oh,thank you, I going to buy the petrol.