1. Cấu trúc "used to" (đã từng làm gì trong quá khứ, nay không còn làm nữa):

+ Câu khẳng định: S + used to + V (infinitive)

- Câu phủ định: S + did not/ didn't + use to + V (infinitive)

? Câu hỏi: Did + S + use to + V (infinitive)?

2. Cấu trúc "be used to" (đã quen với việc gì đó):

+Câu khẳng định: S + be (am/is/are) + used to + V-ing hoặc noun

- Câu phủ định: S + be (am/is/are) + not + used to + V-ing hoặc noun

? Câu hỏi: Be + S + used to + V-ing hoặc noun?

3. Cấu trúc "get used to" (đang dần quen với việc gì đó):

+ Câu khẳng định: S + be (am/is/are) + getting used to + V-ing hoặc noun

- Câu phủ định: S + be (am/is/are) + not + getting used to + V-ing hoặc noun

? Câu hỏi: Be + S + getting used to + V-ing hoặc noun?

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Vd mỗi cấu trúc 2 câu ví dụ:

*Cấu trúc "used to"

1) I used to play the piano when I was a child. 

- I didn't use to play the piano when I was a child.

? Did you use to play the piano when you were a child?

2) They used to live in a small town.

- They didn't use to live in a small town.

? Did they use to live in a small town?

* Cấu trúc "be used to"

1) She is used to getting up early. 

- She is not used to getting up early.

? Is she used to getting up early?

2) I am used to the noise of the city.   

- I am not used to the noise of the city.

? Am I used to the noise of the city?

* Cấu trúc "get used to"

1) He is getting used to living alone. 

- He is not getting used to living alone.

? Is he getting used to living alone?

2) They are getting used to the new job. 

- They are not getting used to the new job.

? Are they getting used to the new job?