$\text{31.}$ Computers was used all over the world . 

→ Bị động thì QKĐ : S + was/were + Vpp + ( by O ) 

$\text{32.}$ Many ancient things are kept in museums . 

→ Bị động thì HTĐ : S + is/am/are + Vpp + ( by O ) 

$\text{33.}$ Work is impotant as family.

→ S + be/V + as + adj/adv + as + N/pronoun 

$\text{34.}$ I have played soccer for 5 years . 

→ S + has/have + Vpp + O 

$\text{35.}$ His hobby is playing computers games . 

→ TT sở hữu + N + be + sth 

$\text{36.}$ I think making pottery is interesting  .

→ find sth/doing sth +adj = think (that) sth/doing sth + is + adj

$#Keisha$

$\text{31.}$ Computers was used all over the world . 

→ S + was/were + (not) + Ved/V3 + ( by sb ) 

→ Đối với chủ ngữ là people khi chuyển sang câu bị động thì ko cần dùng by O 

$\text{32.}$ Many ancient things are kept in museums . 

→ S + is/am/are + (not) + Ved/V3 + ( by sb ) 

→ Đối với chủ ngữ là they khi chuyển sang câu bị động k cần dùng by O 

$\text{33.}$ Work is as important as family . 

→ Ta có : as + adj + as : như .... như 

$\text{34.}$ I have played soccer for 5 years . 

→ S + has/have +(not) + Ved/V3 + for/since + ... 

$\text{35.}$ His hobby is playing computer games ( đề thiếu playing ) 

→ vì có chữ hobby nên sau tobe đều là V-ing 

$\text{36.}$ I think making pottery is interesting . 

→ S + think(chia theo thì) + V-ing + be + adj/adv