make these sentences passive, mentioning the agent only when necessary

1. yesterday morning somebody attacked Mr.Foster on his way to work.

2. The Prince of Wales has opened a new university in York

3. Paul and Karen are redecorating the living room

4. Tim gave Lucy a diamond ring on her birthday

5. We must warn them of the danger

6. Phil will leave the tickets for us in the box office

7. They sent a birthday card to Gary

1. Yesterday morning, Mr. Foster was attacked on his way to work.

2. A new university has been opened by the Prince of Wales.

3. The living room is being redecorated by Paul and Karen.

4. A diamond ring was given to Lucy on her birthday by Tim. 

5. They must be warned of the danger.

6. We will be left the tickets in the box office by Phil.

7. Gary was sent a birthday card.

``

Bị động:

- QKĐ: S + was/were + V3/ed

- HTTD: S + is/am/are + being + V3/ed

- TLĐ: S + will be + V3/ed

- HTTD: S + have/has + been + V3/ed

- Động từ khuyết thiếu: S + V_khuyết + be + V3/ed

Những câu có "by sb" ở cuối câu khi "sb" là: danh từ đã xác định (tên người,....)

`\color{#145277}{N}\color{#246483}{a}\color{#34768F} {e}\color{#44889B}{u}\color{#539AA7}{n}`

`***` Công thức câu bị động các thì : 

`@` HTĐ : S + am / is / are + V3/ed

`@` HTTD : S + am / is / are + being + V3/ed

`@` HTHT : S + have / has + been + V3/ed

`@` QKĐ : S + was / were + V3/ed

`@` QKTD : S + was / were + being + V3/ed

`@` QKHT : S + had + been + V3/ed

`@` Modal verbs : can, could, may, might, should, ought to, must, have to, will, would, be going to + be + V3/ed

`-` Thứ tự của Object : chốn `-` nhân (by O) `-` gian

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

`1.` Yesterday morning Mr. Foster was attacked on his way to work.

`2.` A new university has been opened in York by the Prince of Wales.

`3.` The living room is being redecorated by Paul and Karen.

`4.` A diamond ring was given to Lucy by Tim on her birthday. 

`5.` They must be warned of the danger.

`6.` We will be left the tickets for us in the box office by Phil.

`7.` Gary was sent a birthday card.