Grammar- asking question

Hi Sir please help.

When do I need to use Does/Do, Is/Are was/Were.

  1. Are item 1 and 3 interchangeable?

  2. Is item 2 different from item 5 and 6?

  3. Are all items acceptable?

  4. What is the client’s and owner’s home address?

  5. Would you know the client’s name representatives and he’s official beneficiary?

  6. Does the site accessible from the Internet?

  7. Is the computer has access to the Internet?

  8. With whom should we coordinate the problem?

  9. Which appropriate team should handle the problem?

  10. Is there someone else could help us with to solve the problem?

Thank you in advance.

  1. Are item(S) 1 and 3 interchangeable?
  2. What (ARE) the client’s and owner’s home address(ES)?
  3. Would you know the clients name(,) representatives and (HIS)official beneficiary?
  4. (IS) the site accessible from the Internet?
  5. (DOES) the computer (HAVE) access to the Internet?
  6. Is there someone else (WHO)could help us solve the problem?

Thank you coach Kitosdad, but why #2 don’t use word “items” for item 5 and 6? and what are the difference on my mistakes between “Is the site” and “Does the computer” on #7-8?

Thank you.