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1705082956
在条件从句中，如果系动词be需要变为一般过去时，当主语为单数时既可以使用was，也可以使用were；主语为复数时，使用were的形式。
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1705082958
If I were the president of a university, I should establish a course in “How to Use Your Eyes”.
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1705082960
倘若我是一所大学的校长，我会开设一门《如何利用双眼》的课程。
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1705082962
If there were no clouds, we should not enjoy the sun.
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1705082964
如果没有阴云密布，我们就不会享受阳光。
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1705082966
If wishes were horses, beggars might ride.
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1705082968
如果愿望是马匹，乞丐也能骑。（意即愿望不等于现实）
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1705082970
If it were not for…是针对当前情况虚拟的一个固定句型，意为“如果没有”、“要不是因为”。
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1705082972
If it were not for hope, the heart would break.
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1705082974
如果没有希望，人心会愁坏。
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1705082976
If it weren’tfor the rocks in its bed, the stream would have no song.
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1705082978
如果溪床没有石块，小溪就不会潺潺歌唱。
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1705082980
If it weren’tfor the fact that every one of us is special, there wouldn’t be any point in giving each person a separate name.
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1705082982
要不是因为我们每个人都与众不同，那么给每人取一个不同的名字就失去了意义。
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20.2 针对过去事实的虚拟
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表示出于主观愿望，违背过去已经发生的事实。其基本表达规则为：在条件从句中，谓语动词使用过去完成时；在主句中，谓语动词形式为would(或could, might, should)接现在完成时。
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1705082989
I would have been a failure if I had let those worries and fears control me.
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1705082991
假如当时让这些忧虑和担心控制了我，我就一败涂地了。
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1705082993
If I had known it would come to this, I would have acted differently.
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1705082995
如果当初我知道结果会这样，我就不会这么做了。
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1705082997
If we hadn’t made what looked like a terrible error, we never would have been forced to rethink our master plan.
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1705082999
倘若当时我们没有犯看似严重的错误，我们就不可能被迫想出我们的总体规划。
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1705083001
Many persons in the world would have scored achievement if they had not wasted the valuable time.
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1705083003
假如没有浪费掉宝贵的时光，世界上会有许多人取得成就。
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