5. A lot of water should be drunk by you
6. The computer is being used by Bill at the moment
7. Something must be done before it’s too late
8. A lot of cigarettes used to be smoked by my father when he was young
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)
TLG: S + is/ am/ are + going to + be + PP + (by O)
S + modal verb (should, must, have to, can, used to,...) + be + PP + (by O)