1, By the age of twelve, Jim was able to speak English fluently.

2, She had gained a lot of working experiences before she applied for that job.

3, We are in great troubles because we have spent all the money.

4, My father knows well about London because he has been there many times.

5, My friend had studied Japanese before she moved to Japan.

6, Peter had owned a big house for 10 years before he moved to the countryside.

7, Where did you live before 1954?

8, Our team had encountered many obstacles before we succeeded.

9, Cindy had been sick until she stopped eating junk food.

10, I had been in Canada for 7 years before I moved to America.

Chúc bạn học tốt nhé!