区别：
1.used to do sth 过去常常做某事
be used to doing sth 习惯于做某事
2. used to do 只指过去时
be used to do 可以指过去，也可以指现在
3. used to do 中，to do 为不定时结构
be used to doing ，to 是介词后面加动名词
例句：
My father used to smoke but he doesn't any longer. 我爸爸以前经常抽烟，但现在再也不抽了
My grandmother is used to living in the countryside. 我奶奶习惯了住在乡下。
I used to get up early. 我过去常常早起。
I used to going to bed at 10:00 every night. 我每晚习惯十点睡觉。
延伸：
be used to do sth 被用来做某事 被动语态
例句：A piece of paper is used to make a plane. 一张纸被用来叠飞机。