Chỉ cần làm câu 1,2,3 thôi

1. Barbara used to stay with an Italian family when she was in Italy 

2. Mert didn't used to smoke at all when he was at the university but now he smokes ten cigarettes a day 

3. Chocolate used to be one of my favorites when I was a young girl 

* Lý thuyết : 

- Các dạng với used to 

(+) S + used to + V-inf : đã từng 

(-) S + didn't used to + V-inf : chưa từng 

(?) Did/ Didn't S + V-inf ? 

------ Chúc bạn học tốt %_% -------- 

$\begin{array}{c} \color{#db1616}{\texttt{#8:34}} \end{array}$

`1` Barbara used to stay with an Italian family in Italy .

`2` Mert didn't use to smoke at all when he was at the university .

`3` Chocolate used to one of my favorites when I was a young girl .

`- - - - - - - - - - - - -`

`@` Cấu trúc với "used to" "đã từng làm gì" :

`(+)` S + used to + V + O .

`(-)` S + didn't use to + V + O .

`(?)` Did + S + use to + V + O `?`