1.I didn't go to school because I was sick
-> I was sick, so I didn’t go to school.
3. He likes playing computer games in his free time
-> His hobby is playing computer games
4. I am interested in watching TV in the evening
-> I enjoy watching TV in the evening
5. I think that learning English is important
-> I find it 's important to learn English
6. My house is bigger than your house 
-> Your house is smaller than my house.
7. This film is not so interesting as the play
-> he play is more interesting than the film.
8. Her book is not the same as mine
-> Her book is different from mine.
9.I enjoy listening to pop music best
-> Pop music is my favorite kind of music.
10. I started playing soccer 5 years ago
-> I have played soccer for 5 years
11. Mary was sick ,so she could not go to school
-> Because Mary was sick, she couldn't go to school.
12.  The last time I met him was 3 years ago
-> I haven't met him for 3 years.
13. Lan went out because she finished her homework
-> Lan finished her homework so she went out.
14. He is interesting in doing morning exercise
-> He enjoys doing morning exercise