Main Verbs and Auxiliary Verbs

Hi There,

I am having trouble understanding Main verbs and Auxiliary verbs could someone please assist me.

If there is a modal verb before the main verb would I class this as a main verb?

I understand that the primary Auxiliary verbs are be, have, do

I have answered the questions as I understand it, however I understand if it is negative or a question it is Auxiliary but I am still not sure.

I would be most grateful if someone could check my answers and explain to me where I have gone wrong and why. Thank you for your time.

Please read the following sentences and decide which sentences include an Auxiliary verb, and which only have one main verb.

1. Chris is in Tokyo at the moment. AUXILIARY

2. Richard might win the tournament. MAIN

3. I should speak to Amy. MAIN

4. I have a million ideas in my head at the moment. AUXILIARY

5. Could you shut the door please. MAIN

6. When does Maki come to England? AUXILIARY

7. I'm the boss here. MAIN

8. I want some chocolate. MAIN

9. Do you have the time please? AUXILIARY

10. Are you working now? AUXILIARY

11. I like fish. MAIN

12. Can you swim 50 meters under water? AUXILIARY