`31.` Grass was being eaten on the meadow by cows.

`32.` You will be met at the station by my cousin.

`33.` Her own company is being run by her.

`34.` Umbrellas and raincoats must be left in the cloakroom by visitors.

`35.`  We were used to make to clean the house by my mother.

`36.` John's homework hasn't been finished by him.

`37.` Advertisements on TV were suggested banning.

`38.` The door will be shut by me if you like.

`39.` A horrible accident has just been seen by us.

`40.` What is language spoken in this country?

~~~~~~~~~~~~~~~~~~~~~~~

\begin{array}{|c|c|c|}\hline \text{}&\text{$\text{Active}$}&\text{$\text{Passive}$}\\\hline \text{Present simple}&\text{$\text{S + V(s/es) + O}$}&\text{$\text{S + am/is/are + P2 + by O}$}\\\hline \text{Present Continuous}&\text{$\text{S + am/is/are + V-ing + O}$}&\text{$\text{S + am/is/are + being + P2 + by O}$}\\\hline\text{Present perfect}&\text{$\text{S + have/has + P2 + O}$}&\text{$\text{S + have/has + been + P2 + by O}$}\\\hline\text{Past simple}&\text{$\text{ S + Ved + O}$}&\text{$\text{S + was/were + P2 + by O}$}\\\hline \text{Past Continuous}&\text{$\text{S + was/were + V-ing + O}$}&\text{$\text{S + was/were + being + P2 + by O}$}\\\hline\text{Past perfect}&\text{$\text{S + had + P2 + O}$}&\text{$\text{S + had + been + P2 + by O}$}\\\hline\text{Simple future }&\text{$\text{S + will + V-infi + O}$}&\text{$\text{S + will + be + P2 + by O}$}\\\hline \text{Future perfect}&\text{$\text{S + will + have + P2 + O}$}&\text{$\text{S + will + have + been + P2 + by O}$}\\\hline\text{Near future }&\text{$\text{S + am/is/are going to + V-infi + O}$}&\text{$\text{S + am/is/are going to + be + P2+ by O}$}\\\hline \text{Modal verb }&\text{$\text{S + ĐTKT + V-infi + O}$}&\text{$\text{S + ĐTKT + be + P2 + by O}$}\\\hline\end{array}