1. Complete the gaps with already, yet, just, ever, never, before 1. We’ve been abroad. 2. The Smith have finished their preparations. 3. Our children haven’t been to a summer camp . 4. I haven’t been to the Art camp. 5. Have you planned your holidays ? 6. Have they been to Africa ? 7. David has been to a computer camp. 8. Has she gone ? 9. We have come home. 10. Have they travelled by boat? 11. Has he failed his exams? 12. We haven’t got his messages. 13. Mary hasn’t spoken to me . 14. The students have finished the test.

1. We’ve already been abroad.
- In this sentence, "already" is used to express that the action of going abroad has occurred in the past.

2. The Smiths have finished their preparations yet.
- In this sentence, "yet" is used to indicate that the action of finishing their preparations has happened by the present moment.

3. Our children have never been to a summer camp.
- In this sentence, "never" is used to emphasize that the action of going to a summer camp has never happened before.

4. I've never been to the Art camp.
- Similar to the previous sentence, "never" is used to express that the action of going to the Art camp has never occurred in the past.

5. Have you just planned your holidays?
- In this sentence, "just" is used to indicate that the action of planning the holidays has happened very recently or a short time ago.

6. Have they ever been to Africa?
- In this sentence, "ever" is used to ask if the action of going to Africa has happened at any time in the past.

7. David has already been to a computer camp.
- Here, "already" is used to express that the action of going to a computer camp has happened before a specified time in the past.

8. Has she gone yet?
- "Yet" in this sentence is used to question if the action of leaving has happened by the present moment.

9. We have just come home.
- In this sentence, "just" is used to indicate that the action of coming home has happened very recently or a short time ago.

10. Have they ever traveled by boat?
- Similarly to sentence 6, "ever" is used to ask if the action of traveling by boat has occurred at any time in the past.

11. Has he ever failed his exams?
- Here, "ever" is used to ask if the action of failing exams has occurred at any time in the past.

12. We haven't received his messages yet.
- In this sentence, "yet" is used to express that the action of receiving his messages has not happened by the present moment.

13. Mary has never spoken to me.
- Similar to sentence 3, "never" is used to emphasize that the action of speaking to me has never happened before.

14. The students have already finished the test.
- In this sentence, "already" is used to express that the action of finishing the test has happened before a specified time in the past.