As usual, the verb without -ся is transitive (it takes an Accusative object), while the verb with -ся is intransitive (it cannot take an Accusative object). To prepare for something, use the -ся verb with к (which always takes the Dative case).
Ћн рљдко готћвится к урћку.
He seldom prepares for the lesson.
Ћн рљдко готћвит урћки.
He seldom prepares his lessons.
Ћн хорошћ подготћвился.
He was well prepared.
© 1981,1982,1991 by R.L.Leed, A.D.Nakhimovsky, A.S.Nakhimovsky
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