`1`.The hurricane has destroyed the small town

`\rightarrow` Thì HTHT : S + have / has + V3 / PII

`2`.The gate will be widened to let the cars run into the yard easily

`\rightarrow` Câu bị động `-` Thì TLĐ : S + will be + V3 / PII ( by O )

`3`.After they had finished their homework . they went to bed

`\rightarrow` After + S + had + V3 / PII , S + Ved / V2 : Sau khi làm gì thì làm gì tiếp theo

`4`.If I knew her number , I would ring her up

`\rightarrow` CĐK Loại 2 :

`-` If - clause : Thì QKĐ : S + Ved / V2

`-` Main - clause : Thì TLTQK : S + would + V

`\text{@ TheFox}`

Đáp án:

`1.`  The hurricane has destroyed the small town.

`-` HTHT ( CKĐ ) `:` S + has / have + V3 / VpII + O.

`-` The hurricane là chủ ngữ số ít `->` Dùng has

`2.`  The gate will be widened to let the cars run into the yard easily.

`-` TLĐ ( CBĐ ) `:` S + will + be + V3 / VpII ( by + O ).

`-` Cấu trúc phụ `:` V + Adv

`3.`  After they had finished their homework, they went to bed.

`-` After + S + had + V3 / VpII + O ; S + V2 / Ved + O.

`->` Hành động xảy ra sau một hành động trong quá khứ.

`4.`  If I knew her number, I would ring her up.

`-` Câu điều kiện loại  `2:`

`->` If + S + V2 / Ved + O ; S + would / could / might + V + O.