Find ONE mistake in each sentence

II.  Find ONE mistake in each sentence.

1. I have left the office as soon as you come back here

2. Have you hear from him since we left the school?

3. I have not receive a lot of information about that project since I moved to another team.

4. I haven’t had any news of John for 2003.

5. My parents first have met each other at the Olympic Games in 1982.

6. For the past two years I did a lot of things.

7. When I came to visit her last night, she is having a bath.

8. Mary was making a dress when she cuts her finger.

9.  The company are planning to buy a lot of new equipment for its gym.

10. Don’t get off the bus until it stopped.

11.The assistant asked Helen whether those shoes was too small for her.

12.If you were on board now, you will experience those marvelous things.
giải thích giúp mik nhé !!!