| 单词 |
used to(used to, would) |
| 例句 |
used to, would
这两个词均含“过去惯常，过去总是”之意。
used to → 指客观地表示过去的习惯，既可是过去经常发生的动作，又可是过去一向存在的状态，比would通俗，往往含今昔感。
would → 指过去经常发生的行为，主观感情色彩较浓，只表过去惯常行为，既不表状态也不表持续动作。不含“过去如此，现在不再这样”的意味。
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| 随便看 |
- underground(underground, subway, tube)
- underneath(below, beneath, under, underneath)
- understanding(agreement, contract, treaty, convention, bargain, understanding, accord)
- understand(know, learn, comprehend, understand)
- understand(understand, comprehend, appreciate, apprehend, grasp)
- under(vice, associate, under, deputy)
- uneasy(nervous, restless, impatient, uneasy)
- unfold(unfold, open)
- unfortunate(unhappy, unfortunate, unlucky, disastrous)
- unhappy(miserable, wretched, unhappy, sorry)
- unhappy(sad, unhappy, gloomy, blue, sorrowful, melancholy)
- unhappy(unhappy, unfortunate, unlucky, disastrous)
- uniform(alike, like, similar, comparable, parallel, uniform, identical)
- uniform(clothes, clothing, coat, dress, garment, robe, gown, uniform, costume, suit)
- union(club, association, institute, league, union, society)
- union(league, federation, union, alliance)
- unique(only, single, sole, unique, alone)
- unite(join, combine, unite, connect, link, attach, couple, associate, relate)
- universal(common, ordinary, commonplace, general, usual, popular, universal)
- universe(space, universe, cosmos)
- university(college, university, institute, school, academy)
- unlucky(unhappy, unfortunate, unlucky, disastrous)
- unwilling(unwilling, reluctant)
- uphold(back, uphold, support, sustain, advocate)
- upright(vertical, perpendicular, upright, erect, plumb)
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