1.used to do:表示过去的习惯性动作,过去如此,现在不再这样了.常译作“过去常常”.(过去时+动词不定式) He used to play basketball when he was young. 他年轻的时候常常打篮球. There used to be an apple tree here. 过去这儿曾经有棵苹果树. 2.be used to doing /n. 表示“习惯于”某一客观事实或状态,不强调动作.(to是介词,后面接名词或动名词) He is used to hard