When do we use 'is', 'are' and 'have'?

English as a Second Language English Vocabulary, Grammar and Idioms
1

Dear Teachers,

I’ve got some questions to ask you:

  1. Five years " is " much too long for me.
  • Why don’t we use : " Are" ?
  1. The clerk and typist " has " been with this company for two years
  • Why don’t we use : " Have " ?
  1. I’m going to take a " two-year English course ".
  • Is this sentence right ?
  1. I don’t have any " sisters and brothers ".
  • Is this sentence right ?

Please help me and thanks a lot in advance.

Nam Steven.

2

Number 3 and 4 are fine. [color=red]Five years IS much too long means the period of 5 years IS too long. [color=blue]The [color=blue]clerk and typist (2 people) must be [color=blue]HAVE been …

3

I am azam , I am married ,but I do not have any children .I have not been in the USA ,so I like to go there.I have two brothers .My brothers live in the USA .I do not have any sister .

4

Azam, Where do we use “is”, “are” and “have”???