used to有三种结构:1、used to do some thing,2、be used to do something,3、be used to doing something或者be used to+n.(名词)。笔者就这三种结构的用法做一个简单、系统性的梳理,供大家教学参考。1.used to do something的用法(1)used to do something这一结构只有过去时,表示现在已不存在的过去的习惯和状态。例如:My grandma used to be a pilot.我奶奶过去是飞行员。People used to burn candles to get light.人们过去常点蜡烛来照明。 Used to have three structures: 1, used to do some thing, 2, be used to do something, 3, be used to doing something or be used to + n. (noun). The author of these three structures to do a simple, systematic combing, for your teaching reference. 1.used to do something usage (1) used to do something This structure, only in the past, indicates the past habits and states that no longer exist. For example: My grandma used to be a pilot. My grandma used to be a pilot. People used to burn candles to get light. People used to light candles.