`1,` This book was bought by my mother last week.

`-` Cấu trúc bị động qkđ: S `+` was/were `+` V-ed/V3…

`2,` They said that they would try their best to succeed.

`-` S `+` told/asked/said `+` that `+` S `+` V(lùi thì)…

${\text{Lùi thì: }}$

`-` will `->` would

`-` we `->` they

`-` our `->` their 

`3,` No mountains in the world are higher than Everest.

(`+`) Cấu trúc so sánh hơn `-` ngắn (giữa 2 người/vật):

`->` S `+` V/tobe + adj/adv `+` -er `+` than `+` O...

`4,` Nam has been learning English for four years.

`-` S `+` started/began `+` V-ing/to V0..

`=` S `+` have/has `+` been `+`  V-ing `+` for + quãng tgian/since + mốc tgian..

`5,` Experiments on animals shouldn't be done.

`-` Câu bị động của đtkt: S `+` đtkt(must/can/..) `+` be `+` V3/V-ed

`6,` House prices have been sharply risen recently.

`-` Cấu trúc bị động HTHT: S `+` have/has `+` been `+` V3/V-ed..

`7,` The boys said that they would have to try their best to win the match.

`-` S `+` told/asked/said `+` that `+` S `+` V(lùi thì)…

${\text{Lùi thì: }}$

`-` we `->` they

`-` will `->` would

`-` our `->` their 

`8,` My favourite painting is more expensive than this painting.

`-` So sánh ngang bằng với từ phủ định `->` So sánh hơn dạng khẳng định.

(`+`) Cấu trúc so sánh hơn `-` dài (giữa 2 người/vật):

`->` S `+` tobe/V + more + adj/adv `+` than `+` O..

`10,` I haven't talked to my aunt in two months.

`-` S `+` last `+` V2/V-ed `+` khoảng thời gian `+` ago.

`=` S `+` have/has `+` not `+`  V-ed/V3 `+` O..