5. 1) would be
2) will be
3) was being
4) would have been
6. 1) were moving
2) were moved
3) had moved
4) had been moving
7. 1) were being studied
2) have studied
3) were studying
4) were studied
8. 1) has already mastered
2) had already mastered
3) mastered already
4) was already mastered
9. 1) were teaching
2) have taught
3) taught
4) were taught
10. 1) has studied
2) was studied
3) had studied
4) had been studied