Sure, here are the correct forms of the verbs in the sentences, along with the indicators for using past simple or present perfect:

1. I **have had** (have) this shirt for nearly four years.
- **Indicator**: "for nearly four years" suggests a period of time up to now, so present perfect is used.

2. Sandra already **tidied** (tidy) her table, but now it's in a mess again.
- **Indicator**: The action is completed in the past, so past simple is used.

3. Morgana **has lost** (lose) her key. She can't find it anywhere.
- **Indicator**: The result of the action is relevant to the present, so present perfect is used.

4. Bon **has been** (be) to Ha Long five times so far. He loves the place.
- **Indicator**: "so far" suggests up to now, so present perfect is used.

5. Of course I can ride a car. But I **haven't ridden** (not/ride) one for years.
- **Indicator**: "for years" suggests a period of time up to now, so present perfect is used.

6. We don't know Janna's husband. We **have never met** (never/meet) him.
- **Indicator**: The action has never happened up to now, so present perfect is used.

7. Rona **rang** (ring) last night.
- **Indicator**: "last night" refers to a specific time in the past, so past simple is used.

8. Your bike looks very clean. **Have you washed** (you/wash) it?
- **Indicator**: The result of the action is relevant to the present, so present perfect is used.

9. They **moved** (move) here in 2000. They **have been** (be) here a long time now.
- **Indicator**: "in 2000" refers to a specific time in the past, so past simple is used. "A long time now" suggests a period of time up to now, so present perfect is used.

10. Is this the first time you **have cooked** (cook) spaghetti?
- **Indicator**: "the first time" suggests up to now, so present perfect is used.

11. We **have worked** (work) for a bank since we **graduated** (graduate) from university.
- **Indicator**: "since" suggests a period of time up to now, so present perfect is used for the first verb. "Graduated" refers to a specific time in the past, so past simple is used for the second verb.

12. We **posted** (post) the parcel three weeks ago. Have you **received** (receive) it yet?
- **Indicator**: "three weeks ago" refers to a specific time in the past, so past simple is used for the first verb. "Yet" suggests up to now, so present perfect is used for the second verb.

13. My grandmother **died** (die) 7 years ago. I **have never met** (never/meet) her.
- **Indicator**: "7 years ago" refers to a specific time in the past, so past simple is used for the first verb. "Never" suggests up to now, so present perfect is used for the second verb.

14. We **have studied** (study) English for 3 years.
- **Indicator**: "for 3 years" suggests a period of time up to now, so present perfect is used.

15. I **have read** (read) that book several times before.
- **Indicator**: "several times before" suggests up to now, so present perfect is used.

16. They **have studied** (study) almost every lesson in that textbook so far.
- **Indicator**: "so far" suggests up to now, so present perfect is used.

17. My son and I **traveled** (travel) to Hong Kong last week.
- **Indicator**: "last week" refers to a specific time in the past, so past simple is used.

18. Janna **was** (be) so happy when she **heard** (hear) the news that she **cried** (cry).
- **Indicator**: All actions refer to a specific time in the past, so past simple is used.

19. They **have just cleaned** (just clean) the bike. It looks new again.
- **Indicator**: "Just" suggests a recent action relevant to the present, so present perfect is used.

20. Lili **bought** (buy) a new house in 2013.
- **Indicator**: "In 2013" refers to a specific time in the past, so past simple is used.