$\text{1. }$He was seen yesterday.

- Bị động quá khứ đơn: S+ was/were+ V_ed/ bqt+ (by+O)

- Chủ ngữ " he" số ít nên dùng tobe: was

$\text{2. }$Where are sports played by her?

- Bị động hiện tại đơn: (?) Wh-question+am/is/are+ S+ V_ed/bqt+ (by+O)

- Chủ ngữ " sports" số nhiều nên dùng tobe: are

$\text{3. }$A cake was eaten last night.

- Bị động quá khứ đơn: S+ was/were+ V_ed/ bqt+ (by+O)

- Chủ ngữ " a cake" số ít nên dùng tobe: was

$\text{4. }$Sport won't be played tomorrow.

- Bị động tương lai đơn: S+ will be+ V_ed/ bqt+(by+O)

$\text{5. }$Where were there books bought?

- Bị động quá khứ đơn: (?) Wh-question+was/were+ S+ V_ed/bqt+ (by+O)

- Chủ ngữ " there books " số nhiều nên dùng tobe: were

$\text{6. }$That book isn't written by her. 

- Bị động hiện tại đơn: S+ am/is/are+ V_ed/ bqt+ (By+O)

- Chủ ngữ " that book" số ít nên dùng tobe: is

$\textit{# Themoonstarhk}$

`-` BĐ :

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

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

`+` TLĐ : S + will be + VpII ( by O )

`1`.He was seen yesterday

`2`.Where are sports played ?

`3`.A cake was eaten last night

`4`.Sport won't be played tomorrow

`5`.Where were three books bought ?

`6`.That book isn't written

`\text{# TF}`