The first one is from the book, the second is 3rd person, and the third is the girls. They are different in the fact that they interpret the conversation in different ways. In the first, they think that their friend isn't taking it seriously. In the second they are trying to help their friend with his soda problem. In the third, they are trying to see how they could stop the students pop intake.
Let's go geeks!
It turns out that most people that buy pop aren't playing sports.
But some of us can't stop.
They are talking about the problem of the soda machine, knowing their friend drinks 3 bottles a day.
Sure you guys can.
We have a problem with our students pop intake.
You thinks so?
I think that the school should raise the prices.
Can't you guys take a joke.
Yeah, you are drinking way too much soda dude.
You think this is funny
Well I can't.
Thats how their project ended.
Yeah, you can just not bring money.
Yeah, it's that easy.
I don't think that anyone would buy soda any more.
Yeah, so what they might not have as many people buying the soda but that's fine