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used to用于疑问句时,可借助助动词 did,也可以将used提到主语前。
【拓展】几个易混结构的比较:
结构
意义
to的作用
used to do sth.
过去常常做某事
不定式符号
use ... to do sth.
用……做……
be used to do sth.
被用来做……
be used to doing sth.
习惯于做某事
介词
一. 根据要求完成下列各题。
1. Jim used to play computer games after school.? (改为否定句)
Jim ___________ play computer games after school.
2. Tony used to keep silent in class.??(改为一般疑问句)
______________ keep silent in class?
didn’t use to?
Did Tony use to
3. Mother used to grow flowers in her garden. (改为否定句)
Mother _____________ grow flowers
in her garden.
4. Bill used to collect stamps when he was in middle school. (改为一般疑问句)
_____________ collect stamps when
he was in middle school?
didn’t use to
Did Bill use to