Divide these verbs into 2 categories: 1st form and 3rd form.

1st form
3rd form
gone

leave

been

walk

open

wash

had

go

be

take

see

have

seen

taken

left

opened

washed

walked

studied

study

Правильное деление такое:

То есть:

1st form: leave, walk, open, wash, go, be, take, see, have, study.

3rd form: gone, been, had, seen, taken, left, opened, washed, walked, studied.

Первая форма — это начальная форма глагола, например go, see, take.
Третья форма — это Past Participle, например gone, seen, taken.