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“used to + 动词原形”表过去的习惯或过
去经常反复发生的动作或状态，但现在已经不再存在了。可用于所有人称。
否定形式为：used not to + do
或：didn’t use to do
疑问形式为：Used … to …?
或：Did … use to …?
I didn’t use to be popular in school.
Did he use to be short? / Used he to be short?
He didn’t use to be short. / He used not to be short.
You used to be quiet, didn’t you?
你以前很文静，是不是?
反意疑问句: 陈述句, didn’t / usedn’t +主语?
My mom used to have curly hair.
She didn’t use to have straight hair.
Jerry used to read books on European history.
She didn’t use to read books on African history.
Sandy used to teach British English.
She didn’t use to teach American English.
Answers to 4a
Five years ago
Now
listened to pop music
enjoys country music
watched scary movies
hates scary movies
didn’t read a lot of books
reads at least six books a year
1. … used to listen to pop music,
but now … enjoys country music.
2. … used to watch scary movies,