used to do sth.句型表示“過去常常,過去習(xí)慣.”表示過去的某種習(xí)慣(過去經(jīng)常反復(fù)發(fā)生的動(dòng)作或狀態(tài)).
e.g.I used to live there when I was a child.
n
否定式：used not to do sth.
口語(yǔ)中：didn’t use to do sth.
(used not可縮寫為usedn’t或usen’t.)
e.g.I used not to live there when I was a child.
I didn’t use to live there when I was a child.
疑問句：used sb.to do sth.
Did sb.use to do sth.
e.g.Used you to live there when you was a child.
Did you use to live there when you was a child?
used to do sth.與be used to (doing) sth.的區(qū)別
1.used to do sth.“過去總做某事”(現(xiàn)在不做了)只用于過去時(shí)態(tài).
e.g.He used to get up early.
2.be used to (doing) sth.表“習(xí)慣于做某事”,可用于現(xiàn)在、過去、將來的多種時(shí)態(tài),be可以用become,get等來代替,此處to是介詞.
e.g.He will be used to getting up early.