$\text{2.}$ Our use of electricity is reduced to save our energy by us.

$\text{3.}$ Is coal replaced by another renewable resource?

$\text{4.}$ Are bread and milk often had for your breakfast?

$\text{5.}$ I am often bought a math magazine on my father's way home by him.

$\text{6.}$ Many lakes and rivers are polluted by pollution from factories.

$\text{7.}$ Flowers are cut in the garden by Lan's grandmother every day.

$\text{8.}$ We are taught how to speak English properly by Mr. Robinson.

$\text{9.}$ Rice is planted in many tropical countries.

* Form: Câu bị động thì HTD:

S + V<s,es> $\text{→}$ S + is/ are/ am + Ved/ P2 + (by)

2.Our use of electricity are reduced to save our energy 

3.Is coal replaced by another renewable resource?

4.Are bread and milk often had for your breakfast?

5.I am often bought a math magazine on my father's way home 

6.Many lakes and rivers are polluted by pollution from factories.

7.Flowers in the garden are cut by Lan's grandmother every morning

8.We are taught how to speak English properly by Mr.Robinson

9.Rice is planted in many tropical countries.

* dùng cấu trúc bị động của thì hiện tại đơn:

  S + am/is/are + V3/ed +(by O )

-I + am

-He/She /It/ tên riêng + is

-We /They/You / A&B + are 

đối với những từ I,you,we,they,he,she,it thì từ câu chủ động sang câu bị động thì ko cần thêm by ở cuối câu

vd: They do homework everyday 

   -> Homework is done everyday

chúc học tốt =D