1.Miss Lan teaches us grammar and writing.

=>We are taught grammar and writing by miss Lan

2.The police have found him several days.

=>He has been found by the police several days.

3.She couldn't open the door of the classroom.

=>the door of the classroom couldn't be opened by her.

4.The government will be build the bridge in next July.

=>The bridge will be built by the government by the govervment in next july.

5.Thomas Edition invented the eclentricity bulb.

=> the eclentricity bulb. was invented by thomas...