一、used to的肯定式、否定式与疑问式
1、肯定式
I used to like pop music.
2、否定式
I used not to like pop music. I usedn’t to like pop music.
I didn’t use to like pop music.
3、疑问式
Used you to like pop music?
Did you use to like pop music?
二、used to与would
（一）共同点
Would与used to都可用来表示过去经常性或习惯性的动作，常常可以换用。如：
When we were boys we used to/would go swimming every summer.
Would与used to都不能用来表示动作发生的具体频度或具体的一段时间。例如，不能说：
I would/used to go to France six times．
He used to live in Africa for twenty years．
上两句应改成：
I went to France six times．
He lived in for twenty years.
（二）不同点
1、used to可指过去的状态或情况，would则不能。如：
I used to have an old car.
2、would表示反复发生的动作。如果某一动作没有反复性，就不能用would，只能用used to。例如：
And from that day on，as soon as he finished his homework, he would play basketball with his friends.（具有反复性）
I used to live in Beijing．（没有反复性）
3、used to表示过去经常性或习惯性的动作或状态现在已经结束，强调过去与现在的对比；would则表示有可能再发生。如：
People used to believe that the earth was flat．
过去，人们总以为地球是扁平的。（现在已不再这样认为）
He would go to the park as soon as he was free．
过去，他一有空就去公园。（现在有可能再去）
三、would的其它用法
表示过去的将来时间。
He said that he would come the next day.
表示过去的意志、意愿。
He would never enter that house again.
用于第二人称，表婉转的请求。
Would you help me?
用于虚拟语气。
I wish the sun would come out.
四、used to与be used to
1、I used to get up early.我过去常常早起。
2、I am used to getting up early.我习惯早起。
3、Wood is used to build the house.木头被用来盖房子。
可以把will would 和 used to放在一起来讲
will （现在时）和would （过去时）都可以来讲
性格行为和习惯
例：Every day Dan will come home from work and turn on the TV.
At school she would always sit quietly and pay attention.
真理用will或would
例：Cold weather will kill certain plants.
During the war, people would eat all kinds of things that we don't eat now.
说话时，可以用will或would批评别人的行为或习惯。
例: She just won't do the washing up when I ask her.
可以用will表达对别人行为的不认同
例：'I feel sick.' 'Well, if you will eaat so much, I'm not surprised.
will表示对某事的假设和结论
例：You will know that Ewan and Lucy are engaged. （我假设你已经知道了）
谈论过去重复发生而且现在不再发生的行为既可以用would也可以用used to，但是句中没有给出明确时间的时候只能用used to不能用would
例：We used to play in the garden. （没有给到时间，不能用We would play...）
Whenever we went to my uncle's house, we would/used to play in the garden.
如果过去的状态现在已经发生改变，只能用used to，不能用would
例：The factory used to be over there. （现在工厂已经不在了）
假设过去某种情形用would have +过去分词
例： I would have been happy to see him, but I didn't have time.
过去假设的情形真的发生了，用will have + 过去分词
例：As it was cloudy, few people will have seen last night's lunar eclipse.
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