Sure! Here are the correct forms for the verbs in the sentences:

1. Are you hungry? You (want) **want** something to eat.
2. Don’t put the dictionary away. I (use) **am using** it.
3. Don’t put the dictionary away. I (need) **need** it.
4. Who is that man? What he (want) **does he want**?
5. Who is that man? Why he (look) **is he looking** at us?
6. Alan says he’s 80 years old, but nobody (believe) **believes** him.
7. She told me her name, but I (not/remember) **do not remember** it now.
8. I (think) **am thinking** of selling my car. Would you be interested in buying it?
9. I (think) **think** you should sell your car. You (not/use) **should not use** it very often.
10. Air (consist) **consists** mainly of nitrogen and oxygen.
11. I’m bored with this programme. What time it (end) **does it end**?
12. Sue (come) **is coming** to see us tomorrow. She (travel) **is traveling** by train.
13. The art exhibition (finish) **finishes** on 3 May.
14. "You (do) **do** anything tomorrow morning?" - "No, I’m free. Why?"
15. Liars are people who (not/tell) **do not tell** the truth.

Let me know if you need any more help!