change these active sentences into pasive voice 

1 who will you invite to your birthday party ?

2 what did he do last week ?

3 how many books does she buy ?

4 who bought that house ?

5 what kinds of cars will you choose

6, where have they found these postcards 

7, Which games are the children playing

8 when do they organize the meeting ?

9 nobody knows his childhood

10 someone stole my bike

11 noone understood what he said in the meeting 

12 who wrote this poem?

13 she didn't find the way to the picnic so she got lost

14 most of people know that famous actress

15 how many cigarettes did he use to smoke?

`1` Who will be invited to your birthday party?

`2` What was done by him last week?

`3` How many books were bought by her?

`4` By whom was that house bought?

`5` What kinds of cars will be chosen by you?

`6` Where have these postcards been found?

`7` Which games are being played by the children?

`8` When is the meeting organized?

`9` His childhood isn't known.

`10` My bike was stolen.

`11` What he said in the meeting wasn't understood.

`12` By whom was this poem written?

`13` The way to the picnic wasn't found by her so she got lost.

`14` That famous actress is known by most of people.

`15` How many cigarettes used to be smoked by him?

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

`***` Bị động

`-` Hiện tại đơn:

`(+)` S + am/is/are + V3/ed + (by O)

`(?)` (Wh) + Am/Is/Are + S + V3/ed + (by O)?

`(?)` Wh + Am/Is/Are + V3/ed + (by O)?

`-` Tương lai đơn:

`(?)` (Wh) + Will + S + be + V3/ed + (by O)? 

`?)` Wh + Will be + V3/ed + (by O)?

`-` Hiện tại hoàn thành:

`(?)` (Wh) + Have/Has + S + been + V3/ed + (by O)?

`(?)` Wh + Have/Has + been + V3/ed + (by O)?  

`-` Quá khứ đơn:

`(+)` S + was/were + V3/ed + (by O)

`(?)` (Wh) + Was/Were + S + V3/ed + (by O)?

`(?)` Wh + Was/Were + V3/ed + (by O)?

`@Huyyy`

`1.` Who will be invited to your birthday party `?`
`2.` What was done by him last week `?`
`3.` How many books are bought by her `?`
`4.` By whom was that house bought `?`
`5.` What kinds of cars will be chosen by you `?`
`6.` Where have these postcards been found by them `?`
`7.` Which games are being played by the children `?`
`8.` When is the meeting organized by them `?`
`9.` His childhood is not known by anybody `.`
`10.` My bike was stolen by someone `.`
`11.` What he said in the meeting was not understood by anyone `.`
`12.` By whom was this poem written `?`
`13.` The way to the picnic was not found by her, so she got lost `.`
`14.` That famous actress is known by most people `.`
`15.`How many cigarettes were used to be smoked by him `?`

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

`-` Bị động các thì liên quan `:`

`+` Tương lai đơn `:` S `+` will (not) be `+` Ved/3 `+ (` by O `)`

`+` Quá khứ đơn `:` S `+` were/ was (not) `+` Ved/3 `+ (` by O `)`

`+` Hiện tại đơn `:` S `+` am/is/are (not) `+` Ved/3 `+ (` by O `)`

`+` Hiện tại hoàn thành `:` S `+` has/have (not) `+` been `+` Ved/3 `+ (` by O `)`

`+` Hiện tại tiếp diễn `:` S `+` am/is/are (not) `+` being `+` Ved/3 `+ (` by O `)`