Ta có:
S+used+to+V(inf)+...
S+didn't+use to+V(inf)+...
Để biểu thị hành động thường xuyên xảy ra ở quá khứ nhưng bây giờ không làm nữa
Ta có đáp án:
2 Did you used to swim in the lake when you were young ?
3 My brother used to have purple hair and a big head.
4 We used to be really good friends, but now we don't speak at all.
5 Did Crystal use to work for your family?
6 The giraffes didn't use to come into the forest before.
7 We used to write letter, but now we only write emails.
8 I didn't use to enjoy cooking, but now I love it.
$#FromTha$