18. The mail had already been delivered the mailman
19. My pen used to be borrowed by him
20. His work had to be finished on time by him
21. All the homework needn't be done by you
22. He ought to be told early by you
23. The room wasn't used very often
24. The road must be widened to school this year
25. Has your homework been done by you?
26. Was your homework finished early by you?
27. Fruit has to be picked very early by her in the morning
28. The house was dirty because it hadn't been cleaned by her for weeks
QKĐ: S + was/ were + PP + (by O)
HTĐ: S + am/ is/ are + PP + (by O)
HTTD: S + am/ is/ are + being + PP + (by O)
HTHT: S + have/ has + been + PP+ (by O)
TLĐ: S + will be + PP + (by O)
S + modal verb + be + PP (+ by O)
