1. We will send a message when I get there.

• when is used to indicate a specific time in the future.

2. You can stay here anytime as long as you promise to keep it clean.

• as long as is used to express a condition.

3. Jane didn't realize her mistakes until her mother pointed it out for her.

• until is used to indicate a time when something happened.

4. Did anybody come to see me while I was out?

• while is used to indicate an action happening during another action.

5. Wait until they return.

• until is used to indicate a time when something will happen.

6. Finish your homework, then you can go join art clubs.

• then is used to indicate a sequence of actions.

7. Since I was a child, I have been afraid of the dark.

• since is used to indicate a time when something started and continues to the present.

8. You can stay with us until you find a suitable apartment.

• until is used to indicate a time when something will happen.

9. How many jobs did you do after you left school?

• after is used to indicate a time following another event.

10. I usually have a snack before I go to bed.

• before is used to indicate a time preceding another event.

11. My friend called me while I was having a bath.

• while is used to indicate an action happening during another action.

12. Yesterday, Jim was playing the piano while his sister was playing the flute.

• while is used to indicate simultaneous actions.