used

used to

句式

used to + 动词原形 ...

“过去常常，以前常常”

to 是不定时符号，后接动词原形。

I used to walk along the river after supper.
过去我常常晚饭后沿着河散步

Used you to be a driver？
Did you use to be a driver？
你以前是位司机吗？

be used to

句式

be/get used to ...

used 是 形容词
to 是 介词

“习惯于 ... ”

My father is used to getting up early.
My father gets used to getting up early.
我父亲习惯早起