1.We can't offer you the job beacause you don't know English.
=>If you knew English, we would offer you the job.
2.Mr Hung was our teacher. We will never forget him.
=>Mr Hung whom we will never forget was our teacher.
3.This is a house.I was born and grew up in this house.
=>This is the house where I was born and grew up.
4.You should drive carefully,or you may have an accident.
=>If you don't drive carefully, you may have an accident.
5.My father can speak both Vietnamese and Chinese perfectly.
=>He is bilingual in Vietnamese and Chinese.
6.English has borrow many words. They come from other languages.
=>English has borrowed many words which comes from other languages.
7.My father can speak English very well.
=>My father can speak Chinese fluently.