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used to的否定形式和一般疑问句形式有两种：
否定形式：didn’t use to 或 usedn’t to
一般疑问句：Did …use to…? 或 Used …to…? 如：
过去他不常喝酒。
He didn’t use to drink beer./He usedn’t to drink beer.
过去他经常打篮球吗？
Did he use to play baskerball?/Used he to piay basketball?
我们常用前者
巩固练习：
I used to collect stamps before.
I ______ _____ to collect stamps before.
____ you _____ to collect stamps before?
Yes, ___ ____. No, ___ ______.
Didn’t use
Did
use
I did
I didn’t
What did you use to do before?
used to do，be used to do 和 be used to doing的区别
used to do表示“过去常常做某事”.
be used to do的意思是“被用来做某事”;
be used to doing的意思是“习惯于做某事”.
重点突破
1.( ) I ______ keep dogs for protection, but now I
keep them as pets.
A．would rather B．had better
C．used to D．have to
2.( ) The knife ______cut things.
A. is used for B. is used to C. used to