... 1/5, = a third, a quarter, a fifth hay one third, one fourth, one fifth . - Dùng trong các thành ngữ chỉ giá cả, tốc độ, tỷ lệ. Ví dụ: five dolars a kilo; four times a day. - Dùng trong các thành ... duty is to study harder. 3. Object: * To infinitive is used as object of these verbs: “ agree, arrange, ask, attemp, begin, care, choose, decide, deserve, determine, edmand, desire, expect, fail, ... Ví dụ: If I had enough money now, I would buy this house ( but now I dont have enough money.) If I had the time, I would go to the beach with you this weekend. (but I dont have the time.) ( Im...