had + participle or would have , all out of the "clause if"

"Examples," not "samples."

You have not provided any examples of if-clauses.

In regard to the two examples that you've provided, it depends on what you're trying to say to determine whether they're correct or not.

In the first instance, "my father" imagined something that he otherwise would never have imagined.

In the second instance, "my father" never imagined in the past with the possibility that he later did imagine.

thank you for answering my question and for correcting me with 'samples' .
i will likely make mistakes with that when speaking but i will at least know why
two more last questions, please XD, i embarrassed about taking adventage of your generosity but i hardly have such a good chance to clarify doubts .
these are the cases :
i have seen that at times are sentences like this one i admitted to having stolen )
according to me and my knowledge , that has to be translated as
(i admitted that i had stolen) ,does`t it ???
other example : (thank you for having come) in this one i do not see other way to transmit that exact idea , or is there ??
in the first example i know that (to) is working as the preposition but when do i realize when to use one form or the other one ? ? ?

this one :
(after having seen . . ) i would say something like : (after we have seen . . .)is thise example a cause of the reduction clause ??
to finally end this up , don `t you know about a webtsite i can interact with native people ?? thank you again , have a good day .

by the way in my first post i typed (can anyone know . . .) perhaps i should`ve typed (does anyone know . . .) what a fool i am jaja