11.3 used to / be used to
?
  used to + do:"過(guò)去常常"表示過(guò)去習(xí)慣性的動(dòng)作或狀態(tài),但如今已不存在。
  Mother used not to be so forgetful.  
  Scarf used to take a walk.  (過(guò)去常常散步)

  be used to + doing: 對(duì)……已感到習(xí)慣,或"習(xí)慣于",to是介詞,后需加名詞或動(dòng)名詞。
  He is used to a vegetarian diet.  
  Scarf is used to taking a walk.(現(xiàn)在習(xí)慣于散步)

典型例題   
---- 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. 本句雖沒(méi)有明確的時(shí)間狀語(yǔ),但從語(yǔ)意上看 出,在聽(tīng)的時(shí)候沒(méi)有聽(tīng)懂這個(gè)動(dòng)作發(fā)生在過(guò)去,因此應(yīng)用過(guò)去時(shí)。