https://www.usingenglish.com/reference/irregular-verbs/quit.html This is in the back of any English textbook, and can be easily found through an online search. Do you mind me asking why you asked this question? :)

Base Form: Quit Past Simple: Quit Past Participle: Quit 3rd Person Singular: Quits Present Participle/Gerund: Quitting

It is "Quitted" Actually, to add on, this appears to be an exception. You can also just use :"Quit". I want to say also , I use "Quit" more often in my essays or messages. "Quitted" is technically correct as the past participle form, but I haven't seen it used as often as "Quit".

I think there are regional differences. In Australia you can use either, but quitted is probably more old-fashioned. I had quitted my job (past perfect) before I met him. I quitted (simple past) in May. Short answer: stick to "quit" and you will be fine!

Hi Zahedi, The past participle form of "Quit" is still "Quit". "Quitted" was used often in the past, and it is not really used anymore. Hope this helps, Cheers, Lance