I often have trouble knowing when to use have or has in sentences and when speaking. What is the rule for using has or have. When is it appropriate to use have and when is it appropriate to use has?

When using the present tense (with 'to have' as the main verb), or the present perfect tense (with 'to have' as the auxiliary verb), 'has' is used only in the third person singular-- that is, when the subject is a single entity that is not you or I: he, she, it, John, the Eiffel Tower, etc.

I have a headache. 
You have a headache.
She/ he/ it/ John/ the Eiffel Tower has a headache.
We have headaches.
You all have headaches.
They have headaches.
I have never eaten locusts. 
You have never eaten locusts.
She/he/it/John/the Eiffel Tower has never eaten locusts.
We have never eaten locusts.
You all have never eaten locusts.
They have never eaten locusts.
have is used with I, you, they
has is used with it, she, and he.

The countable and uncountable nouns sometimes can create lots of confusion as to whether to use singular (has) or plural (have).

Police, as strange as it might seem, is referred to as plural noun and therefore takes have as in:

The police have arrested a suspect in connection to the recent robberies in this neighborhood.

Here are some more examples:

She has just quit her job.
I have hired a new secretary to replace her.
I have to pay her more money though.
You have to train her as to what she has to do.
The scissors have dull edges.
My glasses have scratches on them
My trousers have holes on them
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Much much too wide a topic, Guest. Can you narrow the topic, perhaps give a few examples of your problem areas. I can't imagine that someone who writes as well as you have here would have any problems.
 Mister Micawber's reply was promoted to an answer.
No really - please, if anyone knows, write it out on the Net. I too would like to know.

Im searching but there are no answers to be found. This is as far as I´'ve come:

Use Has -. when only one of easch thing, It, She,m He , A /An/One etc

Or If a colletive , for instance the family/the Police is seen upon as one then has (in America), but in Britain its have ..

(BUT it varies in British English and America English and ...)

And to get even more confused...everybody anybody nobody and someone/somebody it to be used with has regardless of number of persons in the group - please commetn on this! Thank you. Nina
Students: We have free audio pronunciation exercises.
 Goodman's reply was promoted to an answer.
What about the sentenses using "and" or "or", such as:

If you or your staff (have or has) any questions, then please contact me.

then which do you use?
Mr. Micawber thank you for the explanation. I understand now. I am sure the same instructions were given to me when I studied grammar but I was less interested in grammar although literature brought out the love in me. Again, thank you.
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in this you will use "have" because there are 2 groups refferd to here.

Our minds are just seriously poluted by the BAD english the americans love some much to speak/write.
i have gone
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