`1.` This supermarket is less expensive than the one across the street

`-` S1 + V + more/fewer/less + noun(s) + than + S2

`2.` The English teacher has been teaching at our school for three years 

`-` S + began / started + to V/ V-ing + time ago 

`=>` S + have/has + P2 / been Ving+ for / since ...

`3.` If you don't study harder, you won't pass the exam

`-` Câu điều kiện loại `1 :` If S + V hiện tại , S + will/can/may + V-inf

`=>` Diễn tả sự việc có thể xảy ra ở hiện tại , tương lai

`4.` What about going to uncle Huan's farm this weekend?

`-` Đề nghị : Shall we+ V..../Let's+ V.../How/What about+ Ving..../Why don't we + V ..

`5.` Sandy studied more intelligently than she does now.

`-` S1 + V + more + adv + than + S2

`6.` It's colder than yesterday 

`-` So sánh hơn ( tính từ ngắn ) : S1 + V + adj-er + than + S2

`7.` It takes four hours by car and five hours by train to finish the journey

`-` It takes/took time + to V-inf : mất bao lâu để

`8.` We are busier at work today than that every day

`-` So sánh hơn ( tính từ ngắn ) : S1 + V + adj-er + than + S2