1.the taxi  taken us to the airport broke down

2.the boy playing chess with you is my uncle

3.the window broken last night has been repaired

4.the man sitting next to me is my father's friend

5.who saw the boy swimming in the pool 2 hours ago

6.the envelope lied on the table has no stamp on it

7.my grandmother never going out the house is old and sick

8.the students sitting for the exam are from singapore

1.i always keep the windows open so as to enjoy fresh air

2.she went to the supermarket so as to buy some sugar

3.she studies english so as to improve her knowledge

4.rachel turns on the tv so as to watch the news

5.nacy is carrying extra course every semester so as to graduate early

6.please shut the door so as not for the dog to go out of the house

7.i wish to have enough money so as to buy a new house

8.we turned on the lights soas not to waste electricity