1,get/be used to sth
get/be used to doing sth是习惯于（做）某事,可以用于多种时态
例如：you will be（get）used to it soon.你很快会适应它的.
he will be used to getting up early.他将会习惯于早起.
,2,be used to do sth
be used for doing sth 被用于做某事
例如：wood is used to make paper.木材被用来造纸.
knife is used for cutting.
3,used to do sth.过去常常做某事（现在不做了）
he used to get up early.他过去常早起.