3.people know that Phong Nha Cave was found in the 16th century by Cham people. Làm 2 cách nha

`-` It is known that Phong Nha Cave was found in the 16th century by Cham people.

`-` Phong Nha Cave is known to have been found in the 16th century by Cham people.

`->` `B`ị động đặc biệt :

`+` People + know + that + S + V

`=` It is known that + S + V

`=` S + be + known + to + have been PII (by O) `->` Nếu V1 và V2 khác thì

`3.` People know that Phong Nha Cave was found in the 16th century by Cham people.

`->` It is known that Phong Nha Cave was found in the 16th century by Cham people.

`->` Phong Nha Cave is known to have been found in the 16th century by Cham people.

`***` Cấu trúc: Bị động không ngôi

`- S_1 + V_1 + th at + S_2 + V_2 + ...`

`-> It + tobe(V_1)+V_1(p2) + S_2 + V_2 + ...`

`-> S_2+tobe(V_1)+V_1(p2) +` (bên dưới)

`+to V_2(text{nguyên thể})`  (Nếu `V_1` song song thì `V_2`) 

`+to have+V_2(p2)` (Nếu `V_1` không song song thì `V_2`)