viết ại câu ( đổi thành bị động ) 1. Companies make boxes out of cardboard because its a cheap material. Boxes ___________________________________________. 2. Builders wont use concrete as much in the future. Concrete _________________________________________. 3. A company called Dupont developed nylon in the 1930s. Nylon ___________________________________________. 4. The builders have broken the glass window. The glass window _________________________________. 5. People will recycle plastic more in the future. Plastic __________________________________________. 6. Someone discovered rubber many years ago in South America. Rubber _________________________________________. 7. People burn wood to heat buildings. Wood __________________________________________.

`1` Boxes are made out of cardboard by companies because it's a cheap material.

`2` Concrete won't be used as much by builders in the future.

`3` Nylon was developed by a company called Dupont in the `1930`s.

`4` The glass window has been broken by the builders.

`5` Plastic will be recycled more in the future.

`6` Rubber was discovered many years ago in South America.

`7` Wood is burnt to heat buildings.

`_______________________________________________`

`***` Bị động:

`1`. HTĐ: S + am/is/are + VpII + (by O)

`2`. TLĐ: S + will be + VpII + (by O)

`3`. QKĐ: S + was/were + VpII + (by O)

`4`. HTHT: S + have/has + been + VpII + (by O)

Bị động - các thì:

- Thì HTĐ: S + am/is/are + V3/ed

- Thì TLĐ:

(+) S + will  be  +V3/ed 

(-) S + won't be + V3/ed 

- Thì QKĐ: S + was/were + V3/ed 

- Thì HTHT: S + has/have + been + V3/ed 

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1. Boxes are made out of cardboard by companies because it's a cheap material.

2. Concrete won't be used as much by builders in the future.

3. Nylon was developed by a company called Dupont in the 1930s.

4. The glass window has been broken by the builders.

5. Plastic will be recycled more in the future.

6. Rubber was discovered many years ago in South America.

7. Wood is burnt to heat buildings.

`color{orange}{~LeAiFuRuiHuiBao~}`