Answer:
1.) When you get here, we will start dinner.
2.) We're not leaving, until you clean your
room.
3.) As you read, you'll notice commas more.
4.) If you ask nicely, then we can go shopping
later.
Explanation:
As per my full understanding,
A sentence that has/requires commas always has two parts.
The interrogative part and the answer part.
e.g) When you get here , we will start dinner
interrogative answer/ second action.
Basically, the second action is usually separated from the first action by a comma.
e.g) We're not leaving , until you clean your room.
1st action 2nd action
leave clean