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(一)used to
used to指“过去常常”，一般用过去时态。在used to结构中，to为不定式符号，后面跟动词原形。
如：(1)We used to play tennis twice a week．我们过去曾经一周打两次网球。
(2)She used to be a teacher． 她过去曾是个老师。
[拓展]
否定式：usedn’t / usen’t to do或used not to do，或didn’t use to do．如：
She usedn’t （used not） to like Tom.
=She didn’t use to like Tom.
疑问式：Used 主语 to do…?或Did 主语 use to do…?如：
Used he to smoke a lot？
=Did he use to smoke a lot？
如：(1)He didn’t use to drink.他以前不常喝酒。
(2)Did you use to be an ORBIS doctor?你以前曾是一名奥比斯*医生吗?
[*注：ORBIS（奥比斯）是一个全球救盲抗盲的国际志愿机构。]
(二)be used to
be used to指“习惯于”，“惯于”，be动词可以根据实际情况采用多种适当的时态。在be used to结构中，to为介词，后面接名词、代词或动名词。
如：(1)I am used to taking the bus to school.我习惯于乘公共汽车上学。
(2)They are used to the hot weather．他们习惯炎热的天气。
(3)She is used to drinking tea.她习惯喝茶。
[拓展]
1．与sth. be used to do sth.的区别。后者的意思是“某物被用来干什么”。如：
A knife is used to cut things.
=A knife is used for cutting things.
译一译：
衣服是用来保暖的。Clothes are used to keep warm．
=Clothes are used for keeping warm.
2．be used to也可以说成get used to．如：
They were used to driving on the left in London．
=They got used to driving on the left in London.
译一译：
(1)他不习惯吃蔬菜。 He isn’t used to eating vegetables.
(2)你已习惯做早操了吗？
Have you been used to doing morning exercises?
或：Have you got used to doing morning exercises?
练习：
根据句意，用used to和be used to的适当形式填空。
1. He ________ spend much time playing games.
2. We ________ Chinese food.
3. Amy ________ be very shy. Now she is not afraid to talk to strangers.
4. Trains ________ be the main kind of transport in China. Now people ________ travelling by plane.
5. We know that the earth moves around the sun, but people ________ believe that the sun moves around the earth.
6. ________ he ________ live in the south? Yes, he did.
7. The old couple ________ already ________ living in the country.
8. ________ he ________ the weather there? Yes, he is.
Keys：
1.used to 2.are used to3.used to4.used to, are used to5.used to6.Did, use to 7.have，been used to8.Is, used to
used to指“过去常常”，一般用过去时态。在used to结构中，to为不定式符号，后面跟动词原形。
如：(1)We used to play tennis twice a week．我们过去曾经一周打两次网球。
(2)She used to be a teacher． 她过去曾是个老师。
[拓展]
否定式：usedn’t / usen’t to do或used not to do，或didn’t use to do．如：
She usedn’t （used not） to like Tom.
=She didn’t use to like Tom.
疑问式：Used 主语 to do…?或Did 主语 use to do…?如：
Used he to smoke a lot？
=Did he use to smoke a lot？
如：(1)He didn’t use to drink.他以前不常喝酒。
(2)Did you use to be an ORBIS doctor?你以前曾是一名奥比斯*医生吗?
[*注：ORBIS（奥比斯）是一个全球救盲抗盲的国际志愿机构。]
(二)be used to
be used to指“习惯于”，“惯于”，be动词可以根据实际情况采用多种适当的时态。在be used to结构中，to为介词，后面接名词、代词或动名词。
如：(1)I am used to taking the bus to school.我习惯于乘公共汽车上学。
(2)They are used to the hot weather．他们习惯炎热的天气。
(3)She is used to drinking tea.她习惯喝茶。
[拓展]
1．与sth. be used to do sth.的区别。后者的意思是“某物被用来干什么”。如：
A knife is used to cut things.
=A knife is used for cutting things.
译一译：
衣服是用来保暖的。Clothes are used to keep warm．
=Clothes are used for keeping warm.
2．be used to也可以说成get used to．如：
They were used to driving on the left in London．
=They got used to driving on the left in London.
译一译：
(1)他不习惯吃蔬菜。 He isn’t used to eating vegetables.
(2)你已习惯做早操了吗？
Have you been used to doing morning exercises?
或：Have you got used to doing morning exercises?
练习：
根据句意，用used to和be used to的适当形式填空。
1. He ________ spend much time playing games.
2. We ________ Chinese food.
3. Amy ________ be very shy. Now she is not afraid to talk to strangers.
4. Trains ________ be the main kind of transport in China. Now people ________ travelling by plane.
5. We know that the earth moves around the sun, but people ________ believe that the sun moves around the earth.
6. ________ he ________ live in the south? Yes, he did.
7. The old couple ________ already ________ living in the country.
8. ________ he ________ the weather there? Yes, he is.
Keys：
1.used to 2.are used to3.used to4.used to, are used to5.used to6.Did, use to 7.have，been used to8.Is, used to