语法是什么,是像help sb do sth这样么?
4个回答

例如: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.