1 . a) The girl (writing) on the blackboard is our best pupil. b) Everything ( written) here is quite right. It
2. a) The house (surrounded) by tall trees is very beautiful.
b) The wall (surrounding) the house was very high.
3. a) Who is that boy (doing) his homework at that table?
b) The exercises (done) by the pupils were easy.
4. a) The girl (washing) the floor is my sister.
b) The floor (washed) by Helen looked very clean.
5. a) We listened to the girls (singing) Russian folk songs.
b) We listened to the Russian folk songs (sung) by the girls.
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