câu 2 là didn't nha 
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         S + used to + V_inf

         S + didn't use to + V_inf

1.When Barbara was Intaly,she used to stay with an Italian family.

2.I didn't use to keen on drinking coffee when I was younger.

3.We used to have interested in my work.

4.I used to mind travelling by train.

5.I used to go to work when I was a child.

6.We used to be much happier when we lived in the countryside.

7.Mr.Michel used to grow tulips.

8.I didn't use to listen to classical music when I was young.

9.My sister didn't used to look so far.

10.He used to love me.