Choose the tense: Present /Past /Future Simple; Present/ Past /Future Continuous; Present/ Past /Future Perfect; Present/

1. Where were you yesterday?2. I have been working on this problem for three months already.3. I worked on this problem three months ago.4. I was working on this problem from 3 to 5 o\'clock yesterday.5. He always works well.6. He will work on this problem tomorrow.7. He will be working on this problem at 3 o\'clock tomorrow.8. They will have finished working on this problem by 3 o\'clock tomorrow.9. He will have translated the half of the article by 3 o\'clock next week.