Assuming you're not talking about 'have' as an indicator of possession or ownership, then it can be used to indicate continuous actions. For instance if you compare the sentences "I have been waiting for three hours" and "I waited for three hours" or "I was waiting for three hours" they all convey different nuances. "I waited" simply conveys a fact, and shows that this action occurred in the past and was completed some time ago. "I was waiting" implies that you were doing something, but then you started doing something different, or something happened, ie. "I was waiting for three hours before you arrived". If you met your friend at the airport you could say this to them on the way home. You would use "I have been waiting" when it was a continuous action that ended very recently, for instance when you first see your friend at the airport. You have been waiting for them, and just finished NOW. I hope this is helpful.

'Have' in english has many meaning and uses.....in general 'have' means i got something.....for example 'i have got a car'........or 'i have got two sisters'......other uses of 'have' in grammar in present perfect 'have or has +been+past participle' for example 'i have been waited u since a year'........