`1.` The exercises are being done in the classroom by the students 

`2.` My motorbike was stolen when I was doing the shopping

`3.` A English song will be sung by the girl 

`4.` Dinner was being had by Lan when I came

`6.` Several school things have been bought lately

`7.` Bicycles mustn't be left in the hall

`8.` Some aspirins should be taken by Mai

`9.` The gate of the house was being painted by Martin at that time

`10.` This house was built some years ago

`11.` My handbag has been taken 

`12.` His work hasn't been finished by noon by Minh

`13.` The work wasn't done yesterday 

QKĐ: S + was/ were + PP + (by O)

QKTD: S + was/ were + being + PP + (by O)

QKHT: S + had + been + 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)

Modal verb: S + modal verb (should, must, have to, can,...) + be + PP + (by O)