1. The Passive Voice

2. Simple Present
Somebody cleans the room every day. The room is cleaned every day.
Jane cleans the room every day. The room is cleaned by Jane every day.

3. Simple Past
Somebody cleaned the room yesterday. The room was cleaned yesterday.
Jane cleaned the room yesterday. The room was cleaned by Jane yesterday.

4. Simple Present ( is/am/are + p.p.)
Thunder is caused by hot air hitting colder air.
Biofuel is made from things that com from the Earth.
It is called Three Kings Day.
I am never invited to parties.
Three Kings Day is also celebrated in the United States.

5. The right hand is used only in the bathroom.
Chocolate is given as a gift on holidays.
Chopsticks are used to pick up food.
Almost all homes are heated using geothermal energy.
Students are asked to speak quietly in class.

6. Simple Past (was/were + p.p.)
The robber was trapped by the police.
The telephone was invented by Alexander Graham Bell.
This house was built in 1960.
The first Harry Potter film was released in 2001.

7. Chocolate beans were taken back to Europe.
They were born in Japan.
Two children were taken to the hospital.
My friends were bitten by a dog last week.

8. Reading Comprehension P.8
1. The Swedish government plans to make Sweden the world’s first oil-free country by the year 2020.
Sweden has a good record for protecting the environment and already uses less oil, compared with most other countries.

9. 2. The government has encouraged people to buy hybrid cars and to use geothermal energy to heat their homes.
3. Using oil causes pollution and global warming, and the world may soon run out of oil.

10. 3. Using oil causes pollution and global warming, and the world may soon run out of oil.