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 cho
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.
——> He 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 disturb 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