`31.` Although she is very old, she is very good at dancing. (although + clause1 + clause2)

`32.` If I were you, I would look for a new place to live. (cấu trúc câu điều kiện loại 2: s + ved/ v2, s + would + v)

`33.` English is spoken all over the world. (cấu trúc câu bị động thì hiện tại đơn: s + be + v3/ pii + (by o)

`34.` Hardly had the workers started working when the accident happened. (hardly + had + s + v3/ pii + when + s + ved/ V2)

`35.` It started raining two hours ago. (s + started/ began + v-ing/ n) 

`36.` I like traveling to the usa. (like + v-ing)

`37.` You should go to school on time (should (not) + v: nên/ không nên làm gì)

`38.` Australia has the biggest cattle station in the world. (cấu trúc câu với so sánh nhất: s + be + the adj-est/ the most adj)

`I`.

`31`.Although she is very old , she is very good at dancing

`\rightarrow` Although + C1 + C2 : Mặc dù

`32`.If I were you , I would look for a new place to live

`\rightarrow` CĐK loại 2 :

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

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

`33`.English is spoken all over the world 

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

`34`.Hardly had the workers started working when the accident happened

`\rightarrow` Hardly + had + S + V3 / PII + when + S + Ved / V2

`II`.

`35`.It started raining two hours ago

`\rightarrow` Cấu trúc : S + started / began + V-ing / N 

`36`.I like travelling to the USA

`\rightarrow` Like + V-ing

`37`.You should go to school on time

`\rightarrow` S + should / shouldn't + V : Nên / Không nên làm gì

`38`.Australia has the biggest cattle station in the world

`\rightarrow` So sánh nhất : S + be + the adj-est / the most adj

`\text{@ TheFox}`