I 

1i have learnt english for 6 years

2 my sister does aerobics to keep fit three times a week

3 you should not break things at tet

4 my friend has an oval face and a staight nose

5 my brothers is more interested in tabletennis than i am

II

1 what a handsome boy

2 unless we save sources of energy, it will end soon

3 this is the first time i have ever met such an intelligent girl

4 you dont need to do that work

5 he has studied english since he was 5

III

1 though he live in england, they dont speak english well

2 that is the girl who is very intelligent

3 because of the tiredness she comé back home to relax

4 if we learn hard we will get good marks