The past participle is equivocated.
The present participle is equivocating.
Formed is the past participle of form.
Please don't equivocate, tell me what you really think.
The past participle is laughed.
The past participle is given.
The past participle is worn.
The present participle form of "talk" is "talking."
The past participle is relied.
If you are referring to "can" as in "to be able to", then the past participle is could. If you are referring the "can" as in "fires" (i.e. The boss cans anyone who doesn't answer her emails immediately) then the past participle is canned.The past participle is the verb in its past tense form.
Sent is the past participle of send.
Introduced is the past participle of introduce.
The past participle form of "grew" is "grown."
The past participle is cultured. The present participle is culturing.