`1.` Did you use to be very talkative at that time ?

`2.` My grandfather used to work at the railway station

`3.` Did Claire use to spend much time alone ?

`4.` The kids didn't use to go to bed early

`5.` We used to meet more often

--------------------------

`**` Used to

`(+)` S `+` used to `+` V-inF ...

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

`(?)` Did `+` S `+` use to `+` V-inF ... ?

`-` Diễn tả hành động đã từng là thói quen , xảy ra ở quá khứ nhưng bây giờ không còn nữa

`1`.Did you use to be very talkative at that time?

`2`.My grandfather used to work at the railway station.

`3`.Did Claire use to spend much time alone?

`4`.The kids didn’t use to go to bed early.

`5`.We used to meet more often.

`#`Công thức `use` to

`+`S + used to + V(inf – nguyên thể)

`-`S + didn’t use to + V(inf – nguyên thể)

`?` Did + S + use to + V(inf – nguyên thể)

`***`tuyetduongthi6