Sure! Here are the rephrased sentences based on the prompts you've provided:

1. How long is it since you used the car?
- When did you last use the car?
- How long have you not used the car?

2. We started living here in 1995.
- We have been living here since 1995.

3. I started learning English in 2000.
- I have been learning English since 2000.

4. My sister began to teach English 20 years ago.
- My sister has been teaching English for 20 years.

5. It began raining half an hour ago.
- It has been raining for half an hour.

6. They have built this hotel for a year.
- They have been building this hotel for a year.

7. He has had his breakfast since 7 o'clock.
- He has been having his breakfast since 7 o'clock.

8. Mr. Ba has talked to our teacher for an hour.
- Mr. Ba has been talking to our teacher for an hour.

9. We started working here 2 years ago.
- We have been working here for 2 years.

10. It's unnecessary for them to drive so fast.
- We don’t need them to drive so fast.

11. The coffee was too weak to keep us awake.
- The coffee wasn't strong enough to keep us awake.

If you need further assistance or modifications, feel free to ask!