used to / be used to及use to和use for分析
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.
use to和use for
*use...to（do)...利用...来做（达到某种目的）...
used their highly placed friends to gain access to the president利用他们那些身居高位的朋友来接近总统；
*use...for doing 表示指某物有什么作用.
use to do强调利用手段达到目的,是有计划,有意识的.而use for doing是（某物）的直接效用,没有“阴谋策划（这样说不很恰当,但便于你理解）”在里面.
注:be used to do(被用来做某事) be used for/used to(习惯于,过去常常） be used to doing(习惯于做某事）