6.
$\text{1.}$ used to work
$\text{2.}$ did Jamie use to go
$\text{3.}$ used to have
$\text{4.}$ didn't use to live
$\text{5.}$ Did you use to cycle
$\text{6.}$ didn't use to watch
$\text{* Used to:}$ đã từng
$\text{(+)}$ Used to-V: đã từng lm gì
$\text{(-)}$ Didn't use to-V: đã từng ko lm gì
$\text{(?)}$ (Wh-) did + S + use to-V?
$\text{→}$ Phân biệt vs be/ get used to + V-ing: quen vs việc gì
