-ÍT vs. -UL, -ÜL
The difference between these suffixes is that –ít expresses an action that has an effect on someone/something, but –ul, -ül refer back to the person like –ik verbs.
You can depend on these English verbs: make, get. Take a look at this:
javít to make better <> javul to get better
The suffix –ít can be parallel with make and –ul, -ül with get.
More examples:
tanít to teach <> tanul to learn, to study
alakít to form <> alakul to take shape
szorít to press <> szorul to get pressed/squeezed
terít to spread out; to lay <> terül to be situated; to lie
merít to dip, to plunge <> merül to dive, to submerge
lazít to loosen <> lazul to loosen, to get loose
szorít to press <> szorul to get pressed/squeezed
hevít to heat <> hevül to get heated
mozdít to move; to get sg to move <> mozdul to move, to get moving
békít to conciliate <> békül to reconcile oneself
megrendít to stagger; to shake <> megrendül to shake, to be shocked
ámít to delude <> ámul to marvel
készít to prepare, to make <> készül to prepare, to be made
A tanár tanít. – The teacher teaches.
A diák tanul. – The student learns/studies.
Kisujját sem mozdítja. – He never stirrs a finger.
A kutya nem mozdul. – The dog won’t move.
A politikusok csak ámítanak. – Politicians delude us.
A nézők ámulnak a filmen. – The viewers marvel at the movie.