have, has, had

You can start by reading about the perfect verb forms here: http://leo.stcloudstate.edu/grammar/tenses.html

Thank you for your information...
I have problem when use them in singular/plurar and first/second/third person...
Which one we need to use for singular/plurar?
Which one we need to use for first/second/third person?

mrworldwarriorWhich one we need to use for singular/plurar?

Present tense: for 3rd person singular, use 'has'. All other persons are 'have'.
Past tense: all persons use 'had'.