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hELLO Teacher

Can we use has/have have instead of has/have had in present perfect?

if yes, then why has/have have why not has/have has?

Is there any sentence which could clarrify it's meaning?

Thanks in advance.
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No, when forming present perfect, past or future perfect, you must use the verb's past participle. The past participle for "to have" is "had."

I have had enough. He had had enough. I will have had enough.

It is incorrect to write I have have enough, or he had have enough or I will have have enough.
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Jack_backCan we use has/have have instead of has/have had in present perfect?
No.
Do you know your "three parts of the verb" for the various verbs? You have to know those!

take, took, taken
see, saw, seen
grow, grew, grown
find, found, found
have, had, had
sing, sang, sung
You can combine has, have, had, and having only with the third of these (underlined above). Maybe you will have to learn the three parts of the verbs before you understand how it works.
has taken, have taken, had taken, having taken - Never has take, has took, have take, have took, ...

has seen, have seen, had seen, having seen - Never has see, has saw, have see, have saw, ...

has grown, have grown, had grown, having grown

has found, have found, had found, having found

has had, have had, had had, having had -- See the comment below.***

has sung, have sung, had sung, having sung
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***Don't confuse the first part -- has, have, had, having -- with the invariable second part -- had.
CJ
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