$@dream$

`1,` The meeting might be canceled tomorrow

`->` Bị động của "might": S + might + be + p.p + (by O).

`->` Chủ ngữ là "they" không cần thêm by O.

`2,` This floor mustn't be swept during the first three days of the New Year.

`->` Bị động của "must: S + must + (not) + be + p.p + (by O).

`->` sweep - swept - swept: quét

`3,` The bride and groom is the happiest at the wedding.

`->` No one/ Nobody + ... + to be + adj-er + than + P/ N.

`=` S + to be + the + adj-est + ...

`4,` Other girls can't dance as beautifully as her.

`->` So sánh hơn: S + V+ more + adv + than + P/ N.

`->` So sánh bằng: S + V + not + as/so + adv + as + P/ N.

`1`. The meeting might be cancelled tomorrow.

`⇒` Cấu trúc: S + might + be + Vpp + by O.

`2`. This floor mustn't be swept during the first three days of the New Year.

`⇒` Cấu trúc: S + mustn't + be + Vpp + by O

`3`. The bride and groom is the happiest at the wedding.

`⇒` Cấu trúc: S + to be + the + adj_est +....

`4`. Other girls can't dance more beautifully than she can.

`⇒` Cấu trúc: S + can't + Vo + more + adv + than + S1 + can