You can use this saucepan for cooking spaghetti.
This aucepan can be used for cooking spaghetti

I have to finish(czy tu nie ma koncowki -ed przypadkiem?) my homework tonight.
My homework have to be finished tonight

You must tidy your bedroom.
Your bedroom must be tidied (by you)

You ought to put these clothes away.
these clothes ought to be put away

The boss gave the secretary some letters to type.
secretary was given some letters to type by boss