giải giúp với a:))))))))))))))))))))

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

`-` BĐ HTĐ: S `+` am/is/are (not) `+` PII `+` (by O)

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

`-` BĐ TLĐ: S `+` will (not) `+` be `+` PII `+` (by O)

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

`-` BĐ QKĐ: S `+` was/were (not) `+` PII `+` (by O)

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

`-` BĐ HTHT: S `+` have/has (not) `+` been `+` PII `+` (by O)

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

`-` BĐ TLĐ: S `+` will (not) `+` be `+` PII `+` (by O)

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

`-` BĐ QKĐ: S `+` was/were (not) `+` PII `+` (by O)

`7.` Wood is burnt to heat buildings.

`-` BĐ HTĐ: S `+` am/is/are (not) `+` PII `+` (by O)

`8.` Her story isn't believed by anyone.

`-` BĐ HTĐ: S `+` am/is/are (not) `+` PII `+` (by O)

`9.` We were disappointed by the concert very much.

`-` BĐ QKĐ: S `+` was/were (not) `+` PII `+` (by O)

`10.` The money was returned by David last month.

 `-` BĐ QKĐ: S `+` was/were (not) `+` PII `+` (by O)

`---------------`

`@` Lưu ý:

`+` Trong câu chủ động với các chủ ngữ “I, They, We, somebody, someone,everybody, everyone,....” thì khi chuyển sang câu bị động ta bỏ By O.

`+` By O đứng trước trạng từ chỉ thời gian và đứng sau trạng từ chỉ nơi chốn.

`color{red}{#Atr}`

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

`2.` Concrete won't be used as much by the 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 burned to heat buildings.

`8.` Her story isn't believed.

`9.` We were disappointed very much by the concert.

`10.` The money was returned by David last month.

`---`

`@` Passive voice (Câu bị động) (Ảnh)