Order

Question 1

Come on, stay for one more round.

Answer 1

You’re out drinking with people. One of the people seems like he’s ready to leave, but you think it would be more fun if he stayed for another drink. You suggest this.
Come on, stay for one more round.
come on
You say “come on” to someone when you’re trying to convince them in a friendly and casual situation. “Come on” means something like “Don’t worry about it; just do it.” Here is another example:

Come on! Tell me what she said!

a round (of drinks)
When people drink together at a bar or party, they usually drink at about the same speed. So everyone gets a new drink at the same time. You call one group of drinks for each person a "round".

It’s customary for one person to pay for an entire round of drinks for everyone, and then someone else pays for the next round. When it’s your turn to pay for a round, you say:

This round’s on me.

Question 2

It depends. What are you making?

Answer 2

Your mother is going to make breakfast. She asks you if you want some. You want to eat something light. Something like bacon or pancakes would be too heavy. So you ask this to find out what she’s going to cook.
It depends. What are you making?
make (food)
You’ve probably learned to use the word “cook” to describe preparing food. But you can also use “make”.

“Make” is a more general term, because “cook” should only be used to describe making food using heat. So you can “cook” pasta or “make” pasta, but it’s odd to “cook” something like a sandwich. Instead, say:

I’m making a sandwich. You want one?

You can “make” meals:

Do you want me to make dinner?

Or drinks that require some preparation:

I’ll make some tea.

It depends (on something).
When someone asks you a question, and you're not sure of the answer, you can say "It depends." This phrase means that you can't answer until you know more information. In the example above, you can't answer the question, "Do you want some breakfast?" until you know what your mother is cooking.

You tell what information you need to know in order to make the decision using “depends on ___”:

It depends on what you’re making.

You can also just say “It depends.” and then ask a question:

A: Do you want to come?

B: It depends. Who else is going?

What is (someone) (doing)?
You ask "What are you (doing)?" to find out about someone's planned (future) actions. Asking in this way makes it sound like you think the listener already has a specific plan.

For example:

What are you doing tonight?

You can also ask other questions, like “Where are you…?”, “How are you…?”, “When are you…?”, and so on.

A: I’m going out for a little while.
B: Where are you going?

In this example, Person B thinks that Person A already knows where they’re going to go so Person B asks “Where are you…”

If you’re going to ask about the future, you have a few choices:

1) What are you making?
2) What are you going to make?
3) What will you make?

For this situation, I chose #1 because the speaker thinks that the mother has already chosen what she’s going to cook. He thinks that the mother is only asking if he wants breakfast so that she knows whether to make enough for 1 person, 2 people, 3 people, etc.

When you think someone already has a strong plan for what they’re going to do in the future, you ask, “What are you ___ing?”

Another example:
A: I’m going out for a little while.
B: Where are you going?