III. Write a form of the verb “use to” and a suitable verb. There are affirmative,  negative and interrogative sentences. 

Công thức used to: dùng để diễn tả về một sự việc, sự kiện hay thói quen ở trong quá khứ mà không còn tiếp tục ở  hiện tại nữa. 

(+) S + used to + V-ing (nguyên mẫu)

(-) S + did not + use to + V-ing (nguyên mẫu)

(?) Did + S + use to + V-ing (nguyên mẫu)?
1. They aren't good friends any more. They used to be good friends.
2. He isn't fat. He didn't use to be fat. 
3. There is a bridge here. There used to be a bridge here. 
4. Mike: They dance. Did they use to dance? ~ Jim: Yes. They won a contest!
5. He doesn't have a home. He didn't use to have a home.

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III. Write a form of the verb “use to” and a suitable verb. There are affirmative,  negative and interrogative sentences. 

Công thức used to: dùng để diễn tả về một sự việc, sự kiện hay thói quen ở trong quá khứ mà không còn tiếp tục ở  hiện tại nữa. 

(+) S + used to + V-inf (nguyên mẫu)

(-) S + did not + use to + V-inf (nguyên mẫu)

(?) Did + S + use to + V-inf (nguyên mẫu)?
1. They aren't good friends any more. They used to be good friends.
2. He isn't fat. He didn't use to be fat. 
3. There is a bridge here. There used to be a bridge here. 
4. Mike: They dance. Did they use to dance? ~ Jim: Yes. They won a contest!
5. He doesn't have a home. He didn't use to have a home.