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1.used to do sth.过去常常做某事

(1)否定形式：didn’t use to do sth. / used not to do sth.

Tom didn’t use to chew gum.=Tom used not to chew gum.

He used not to go shopping by car.=He usedn't to go shopping by car.

(2)疑问形式：Did+主语+use to+动词原形+其它?=Uesd+主语+to+动词原形+其它?

Did Tom use to chew gum?=Used Tom to chew gum?

Did he use to go shopping by car?=Used he to go shopping by car?

(3)反意疑问形式：①肯定did/used+主语 ②否定didn’t/usedn’t+主语

He used to play football after school，usedn’t /didin’t he?

There didn’t use to be a big house,here,did it/used it?

①He used to smoke， ?

②They usedn't to like opera， ?

③They didn't use to like opera， ?

④They like opera，did they?

⑤You live in Wuhan，usedn't you?

⑥You used to like wine， ?

辨析：

Ⅰ.be/get/become+used to意为“习惯于”，从形态上看，used为形容词，to是介词，因此后面只能跟名词或动名词。

⑴他们已习惯于住在农村。 They got used to living in the countryside.

⑵他习惯于艰苦工作。 He is used to hard work.

Ⅱ.be used＋带to的不定式意思是“用于做……”，可以用于各种时态的句子。例如：

⑴牛可用来耕地。 An ox is used to plough the fields.

⑵这个地方已经用于种蔬菜了。This place has been used to plant vegetables.

2.反意疑问句

①肯定陈述句+否定提问　如：Lily is a student, isn’t she?

Lily will go to China, won’t she?

②否定陈述句+肯定提问 如：She doesn’t come from China, does she?

You haven’t finished homework, have you?

③提问部分用代词而不用名词 Lily is a student, isn’t she?

④陈述句中含有否定意义的词，如：little, few, never, nothing, hardly等。其反意疑问句用肯定式。 如：

He knows little English, does he?　他一点也不懂英语，不是吗?

They hardly understood it, did they?他们几乎不明白，不是吗?

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