I gave her a seat on which to sit.
(³ª´Â ±×³à¿¡°Ô ¾ÉÀ» ÀÇÀÚ¸¦ ÁÖ¾ú´Ù.)
I looked for a room in which to sleep.
I looked for a room to sleep in.
He has a basket in which to carry these apples.
I found a friend to play with.
I need a knife with which to cut the cake.
I have no words with which to express my thanks.