1. At this time yesterday, the letters were being typed in the office by Mary.

-  S + was/ were + being + Vpp + (by O).

2. At 8 oclock last Sunday, a tree was being planted by Mr. Pike.

- Chủ ngữ số ít (a/an + N số ít)

⇒ Đi với tobe "was"

3.  At 8 oclock last Sunday, was a tree being planted by Mr. Pike?

-  Was/ Were + S + being + Vpp + (by O)?

4.  When I met Mary yesterday, the letters had been finished typing.

- S + had been + Vpp + (by O).

5.  By 3p.m yesterday, the tree had been planted by Mr. Pike.

6. The letters will be typed in the office by Mary tomorrow.

-  ( + ) S + will be + Vpp + (by O).

7. A tree will be planted by Mr. Pike next weekend.

8.  Will a tree will be planted by Mr. Pike next weekend?

-  Will + S + be + Vpp + (by O)?

9. The letters are going to be typed in the office by Mary.

- S + am/is/are + going to be + Vpp + (by O).

10. A tree is going to be planted by Mr. Pike.

11.  Is a tree going to be planted by Mr. Pike?

- Am/Is/Are + S + going to be Vpp + (by O)?

12. At this time tomorrow, the letters will being typed in the office by Mary.

- S + will being Vpp + (by O).

13. At 3p.m tomorrow, a tree will being planted by Mr. Pike.

$Answer:$

`1.` At this time yesterday, the letters were being typed in the office by Mary.

`2.` At `8` o'clock last Sunday, a tree was being planted by Mr.Pike.

`3.` At `8` o'clock last Sunday, was a tree being planted by Mr.Pike?

`4.` When I met Mary yesterday, the letters had been being typed by her.

`5.` By `3` p.m yesterday, the tree had been planted.

`6.` The letters will be typed in the office by Mary tomorrow.

`7.` A tree will be planted by Mr.Pike next weekend.

`8.` Will a tree be planted by Mr.Pike next weekend?

`9.` The letters are going to be typed in the office by Mary.

`10.` A tree is going to be planted by Mr.Pike.

`11.` Is a tree going to be planted by Mr.Pike?

`12.` At this time tomorrow, the letters will be being typed in the office by Mary.

`13.` At `3` p.m tomorrow, a tree will be being planted by Mr.Pike.

$Explain:$

`@` Câu bị động thì quá khứ tiếp diễn:

S(O) + was/were + being + `V3` + (by + somebody).

`@` Câu bị động thì quá khứ hoàn thành:

S(O) + had + been + `V3` + (by + somebody).

`@` Câu bị động thì tương lai đơn:

S(O) + will + be + `V3` + (by + somebody).

`@` Câu bị động thì tương lai gần:

S(O) + is/are + going to + be + `V3` + (by + somebody).

`@` Câu bị động thì tương lai tiếp diễn:

S(O) + will be + being + `V3` + (by + somebody).

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