How long have you studied at your school? how long have you lived in this citi? how long have you known your best friend? how long have you had your pet? how long have your father known your mother? how long have your family lived in your flat (house)?

1 How long have you studied at your school? 
I have  studied for 8 years  at my school.
2 How long have you known your best friend?
I have   known my best friend for 10 years.
3 How long have you had your pet?
I have had my pet since I was 6.
4 How long has your father known your mother?
He has  known my mother since his childhood.
5 How long have your family lived in your flat (house)?
We have lived in our flat for 12 years.

1. a) The girl (writes) on the blackboard is our best student. b) Everything (written) here is absolutely true. This is 2. a) The house (surrounded) of tall trees is very beautiful. b) The wall (surrounding) of the house was very high. 3. (a) Who is this boy (doing) his homework at this table? b) The exercises (performed) by the students were simple. 4. a) The girl (washes) the floor of my sister. b) Paul (washed) Elena looked very clean. 5. a) We listened to girls (sing) Russian folk songs. b) We listened to Russian folk songs (performed) by girls.

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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