1Ann is proud of her ability to speak five languages fluently. (prides)

-> Being able to speak five languages fluently is what ann prides herself on

2, Please come as early as possible (better)

-> You should come the sooner,the better

3, "You have done an excellent job, Lucie" said the teacher (congratulated)

the teacher congratulated Lucie on having done an excellent job

4, They say that the computer is playing important part in modern life (role)

-> The computer is said to be playing an important role  in modern life

5, Shortly before my eighteenth birthday, I will go to universty (student)

-> By the time i am eighteenth,i will have been a universty student