1.Hỏi về mục đích - why ? tại sao ? Ex: Why do you want to learn English? - what for? để làm gì ? Ex : what did you buy it for? - what is the purpose of ? Mục đích của là gì? Ex: what is the purpose of her visit? 2. Diễn tả mục đích a. For + Noun ( phrase) : để Ex: He has gone out for dinner I went to the supermarket for some foods b. To do : để Ex: He has gone out to eat dinner Lưu ý : She has been to the post office for buying stamp > câu này sai She has been to the post office to buy stamp > câu này đúng Tuy nhiên có trường hợp ngoại lệ To be used for doing / to do Ex : A knife is used for cutting A knife is used to cut ( cả hai câu đều đúng) c. In order to do = so as to do Ex: He finished work early .He wanted to see the football match. > H e finished work early in order to see the football match + In order not to do = so as not to do Ex: We whisper .We didn"t want to disturb him. > So as not to disturrb him, we whisper + In order for sb/ sth to do : Để cho ai đó / cái gì làm gì Ex: In order for the lift to work you must press this button d. with a view to + V_ing : để làm gì , với ý định làm gì Ex: With a view to preparing this report, I will visit a number of venues and attended quite a lot of games e. So that / In order that + S__V ( can , could , may , might , will, would) Ex: I left the letter on the table . I wanted him to see it when he came in = I left the letter on the table so that he could see it when he came in We were speaking quietly .We didn"t want anyone to hear us = We were speaking quietly in order that no one could hear it f. For fear that S_V ( should): vì sợ rằng Ex: I am telling you this for fear that you should make a mistake . - what is the purpose of ? Mục đích của là gì? Ex: what is the purpose of her visit? 2. Diễn tả mục đích a. For + Noun ( phrase) : để Ex: He has gone out for dinner I went to the supermarket. 1.Hỏi về mục đích - why ? tại sao ? Ex: Why do you want to learn English? - what for? để làm gì ? Ex : what did you buy it for? - what is the purpose of ? Mục đích của là gì?