$\text{1. This old house was built by my father in 1990}$

- Câu bị động thì QKĐ : S + was/were + P2

$\text{2. Portuguese is spoken in Brazil }$

- Câu bị động thì HTĐ : S + am/is/are + P2

$\text{3. A bunch of flowers will be given by John later }$

- Câu bị động thì TLĐ : S + will + be + P2

$\text{4. The work should be done immedialety }$

- Câu bị động của ĐTKT : S + ĐTKT + be + P2

$#Thương$

`1.` This old house was built by my father in 1990

`-` BĐ QKĐ: S + was/were + Vpp + ... + by O 

`2.` Portuguese is spoken in Brazil

`-` BĐ HTĐ: S + am/is/are + Vpp + ... + by O

`3.` A bunch of flowers will be given for her by John

`-` Bị động TLĐ: S + will + be + Vpp + .. + by O

`4.` the work should be done immediately

`-` Bị động với ĐTKT: S + Modals Verb + be + Vpp + ... + by O