Change the sentences using the passive voice 1) my friend met me at the station 2) she often visits her old granny 3) i have just read the letter 4) our students are discussing an interesting subject , !

1) I was met at the station by my friend.
2) Her old granny is often visited by her.
3) The letter has just been read by me.
4) An interesting subject is being discussed by our students.