III. Put the verbs into the Past Simple or Present Perfect. 1. I ... (not / finish) my homework yet.

2. We ... (not / see) him since he ... (leave) school.

3. We ... (go) to bed very early last night because we ... (be) tired.

4. They ... (move) to London 2 years ago.

5. She ... (not / ring) me since Tuesday.

6. I ... (just / see) a very interesting programme on TV.

7. I ... (see) an old friend of mine last week.

8. I ... (not / be) to a disco for months.

9. My little sister ... (not / learn) to read yet.

10. He ... (lose) his key. He ... (leave) it on the bus yesterday.

11. I ... (not / play) tennis since I was at school but I ... (be) very good at it then.

12. John ... (break) his leg. He ... (fall) off a horse last week.

13. We ... (sell) our house. Some people ... (see) it last month and ... (buy) it.

14. I ... (finish) decorating my room. I ... (paint) it last week and I ... (put up) the new curtains last night.

15. We ... (know) Kate since last year. We ... (meet) her at аparty.

16. I ... (never / be) to France. I ... (want) to go last summer but I ... (can / not).

17. I … (not / be) out since we ... (move) to our new house.

18. Tom ... (see) this film twice. The last time he ... (see) it ... (be) a week ago.

1. I have not finished my homework yet.
Explanation: The action of finishing the homework is not completed at the moment of speaking. We use the Present Perfect tense to indicate an action that started in the past but has a connection to the present.

2. We have not seen him since he left school.
Explanation: The action of seeing him is not completed at the moment of speaking. We use the Present Perfect tense to indicate an action that started in the past but has a connection to the present. The action of leaving school happened in the past, so we use the Past Simple tense.

3. We went to bed very early last night because we were tired.
Explanation: The action of going to bed and being tired happened in the past, so we use the Past Simple tense.

4. They moved to London 2 years ago.
Explanation: The action of moving to London happened in the past, so we use the Past Simple tense.

5. She has not rung me since Tuesday.
Explanation: The action of ringing me is not completed at the moment of speaking. We use the Present Perfect tense to indicate an action that started in the past but has a connection to the present.

6. I have just seen a very interesting programme on TV.
Explanation: The action of seeing the program is completed at the moment of speaking. We use the Present Perfect tense to describe a recent action or experience.

7. I saw an old friend of mine last week.
Explanation: The action of seeing the old friend happened in the past, so we use the Past Simple tense.

8. I have not been to a disco for months.
Explanation: The action of going to a disco is not completed at the moment of speaking. We use the Present Perfect tense to indicate an action that started in the past but has a connection to the present.

9. My little sister has not learned to read yet.
Explanation: The action of learning to read is not completed at the moment of speaking. We use the Present Perfect tense to indicate an action that started in the past but has a connection to the present.

10. He lost his key. He left it on the bus yesterday.
Explanation: The action of losing the key and leaving it on the bus happened in the past, so we use the Past Simple tense.

11. I have not played tennis since I was at school, but I was very good at it then.
Explanation: The action of playing tennis and being good at it happened in the past, so we use the Past Simple tense.

12. John broke his leg. He fell off a horse last week.
Explanation: The action of breaking the leg and falling off the horse happened in the past, so we use the Past Simple tense.

13. We have sold our house. Some people saw it last month and bought it.
Explanation: The action of selling the house and people seeing and buying it happened in the past, so we use the Present Perfect tense for the first sentence and the Past Simple tense for the second and third sentences.

14. I have finished decorating my room. I painted it last week, and I put up the new curtains last night.
Explanation: The action of finishing decorating, painting, and putting up the new curtains happened in the past, so we use the Present Perfect tense for the first sentence and the Past Simple tense for the second and third sentences.

15. We have known Kate since last year. We met her at a party.
Explanation: The action of knowing Kate and meeting her happened in the past, so we use the Present Perfect tense for the first sentence and the Past Simple tense for the second sentence.

16. I have never been to France. I wanted to go last summer, but I could not.
Explanation: The action of never going to France, wanting to go, and not being able to go happened in the past, so we use the Present Perfect tense for the first sentence and the Past Simple tense for the second and third sentences.

17. I have not been out since we moved to our new house.
Explanation: The action of being out is not completed at the moment of speaking. We use the Present Perfect tense to indicate an action that started in the past but has a connection to the present. The action of moving to the new house happened in the past, so we use the Past Simple tense.

18. Tom has seen this film twice. The last time he saw it was a week ago.
Explanation: The action of seeing the film happened in the past, so we use the Present Perfect tense for the first sentence. The action of seeing the film last time and it being a week ago happened in the past, so we use the Past Simple tense for the second and third sentences.