used to do的否定句和疑问句

Question

如题所述

Answer 1

used
一分为二
第一种
把used
看成情态动词
那么否定就是直接在情态动词后面加not，
疑问就是把used
提前
否定形式就是
used
not
to
do
=usdn't
to
do
疑问形式就是used...to
do
第二种
把used
看成是use的过去花窢羔喝薏估割台公郡式，也就是句子为一般过去时
那么否定就是didn't
use
to
do
(一般过去时的否定就是did
not
+动词原形)
疑问形式就是
did...use
to
do
(一般过去时的助动词did提前，那么use应该用原形)

Answer 2

used to do sth. 句型表示“过去常常，过去习惯。”表示过去的某种习惯(过去经常反复发生的动作或状态)。

e.g. I used to live there when I was a child.

n
否定式：used not to do sth.

口语中：didn’t use to do sth.

(used not可缩写为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.

疑问句：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.与be used to (doing) sth.的区别
1. used to do sth. “过去总做某事”(现在不做了)只用于过去时态。
e.g. He used to get up early.
2. be used to (doing) sth. 表“习惯于做某事”，可用于现在、过去、将来的多种时态，be可以用become, get等来代替，此处to是介词。
e.g. He will be used to getting up early.