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simple present of HAVE + PAST PARTICIPLE

I have invited him to my party.
You have lived here since 2012.
She has spoken French all her life.
We have met them today.

past participle of regular verbs

past participle = infinitive + ED

talked
waited
asked
answered

special: drop the end -E of the infinitive

invite -> invited
receive -> received

past participle of irregular verbs

Irregular means that they don't follow rules.
And so we can't describe the form in general.
There is only one way to know the correct form: memorize it.

Some examples:
to break -> broken
to drink -> drunk
to eat -> eaten
to grow -> grown
to sit -> sat

Here is a list of irregular verbs and their forms.
If you click the link, you can see the list.
If you right click it, you can download the list to your computer.