有区别的。前者。常用过去时态，后加动词原形。例如，I used to fet up early but now I didn't后者意思是主语被用来做……例如Knief is used to cut hard things.
use to 用...来做某事 He uses a knife to cut.be used to do 被用作做某事 Knives are used to cut food. 被动语态
