`1,` The accident was caused in this city by some drunk drivers

`2,` Their friends were met at the railway station by a group of students

`3,` A great deal of tea is drunk in England

`->` BĐ - HTĐ : S + am/is/are + P2 + (by O) ...

`->` Chủ ngữ "a great deal of tea" là số ít `->` dùng tobe "is"

____________________________

`@` BĐ - QKĐ : S + was/were + P2 + (by O) ...

`**` I/He/She/It/Số ít + was

`**` You/We/They/Số nhiều + were

`**` by someone/people/they/he/she/ ... `->` bỏ

`**` Vị trí : adv of place, by agent, adv of time

`1.` The accident in this city was caused.

`2.` Their friends were met by a group of students at the railway station.

`3.` A great deal of tea is drunk by people in England.

S + am/is/are + PII + (by O)

S + was/ were + Vp2.... (by S)