一个关于英语的问题,be used to doing, used to do,的语法怎样区别呢?求大神帮助

一个关于英语的问题,be used to doing, used to do,的语法怎样区别呢?求大神帮助
在牛津8B的第5课中,be used to ,和used to语法怎样理解呢?

used to / be used to used to + do：过去常常表示过去习惯性的动作或状态,但如今已不存在.Mother used not to be so forgetful.Scarf used to take a walk.(过去常常散步) be used to + doing：对……已感到习惯,或习惯于,to是介词,后需加名词或动名词.He is used to a vegetarian diet.Scarf is used to taking a walk.(现在习惯于散步) 典型例题 ---- Your phone number again?I ___ quite catch it.---- It's 69568442.A.didn't B.couldn't C.don't D.can't 答案A.本句虽没有明确的时间状语,但从语意上看 出,在听的时候没有听懂这个动作发生在过去,因此应用过去时.