(1) They knew a lot of different girls, and would often go to the beach with them if the weather was good.) (Passage A, Unit 1)
(2) That used to suggest a man, not a woman. (Passage A, Unit 2, Preband 1)
(3) Think of all the words that used to end in -man. (Passage A, Unit 2, Preband 1)
上面第(1)例中的would表示过去的习惯动作；第(2)、(3)例中的used to则表示过去的状态。情态助动词would和used to都可用来表示过去经常的或习惯的动作，两者常可替换使用。例如：
When we were children, we would / used to go swimming every summer.
I would / used to take this bus every day.
He would / used to read in this library when he was at this university.
As a child, she would / used to pass this shop every day after school.
两者相比，used to更强调现在已不复存在的过去的习惯。例如：
He used to play football, but it was a long time ago.
I used to go to the cinema very often, but now I seldom do that.
除了表示过去的动作以外，used to还可表示过去持续的状态或情形。在这种情况下，只可用used to，不可用would。例如：
I used to have a very old car.
[误] I would have a very old car.
They used to live in New York.
[误] They would live in New York.
He used to be better off than he is now.
[误] He would be better off than he is now.
People used to believe that the sun went around the earth.
[误] People would believe that the sun went around the earth.
此外，请提示学生注意：used to表示不确定的过去时间，通常不能与表示次数或延续时间的时间状语连用。例如：
[误] I used to go to France seven times.
[误] He used to stay in Paris for two weeks.
需要提示学生注意的还有：used to和be used to形式上接近，但意义、结构和用法都不同，不可混淆。例如：
He used to live here. (他过去住在这里。)
He is used to living here. （他住在这里已经习惯了。）
would 和used to 的语法比较
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