1) The girl writing something on the blackboard is my friend
2) This is a/the letter adressed to you.
3) Going through the park I met my teacher.
4) I like to read stories written by this author.
5) He did not go to the teacher with us, saying that he was busy.
6) The man standing at the window is a well known actor.
7) Do you know the boys playing tennis now?
8) We were walking about the hall looking at the pictures on the walls.
9) Answering the questions, Jhon made a mistake.
10) Mary found the key lost by me yesterday.
11) They fell asleep immediately, being tired by their journey.
12) I live in a house built a hundred years ago.
13) Did you understand the rules explained to us yesterday.
Parctiple1 - действительный залог, Parctiple 2 - страдательный.