a, She has been heard to sing this song several times. ( bị động với từ chỉ giác quan, S + be( chia theo thì ở chủ động) + Ved/V3+toV/Ving by sb)
b, He was seen to steal your car.( như a)
c, They are being watched to work by the teacher. ( bị động ht tiếp diễn: S +is/are/am+being +Ved/V3 by sb)
d, The children aren't made to work hard. (bị động của make: S+be ( theo thì ở chủ động)+Ved/V3 to smt by sb)
e, He was made to work all day. ( như d)
f, The woman was seen putting the jewelry in her bag by the detective. ( như a)
g, The hostage was made to lie down by the terrorists. ( như d)