They are about 'unreal' situations: things which are possible, desirable, or imaginary.
1&3 are in the subjunctive mood. 虚拟语态。
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agreed!! a bit more:
-最西边的岛上-
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08/22/2024 postreply
11:41:27
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我也是这样理解
-天南地北-
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08/22/2024 postreply
12:39:30
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如果用的是虚拟语气,比如例子1,实际上是没有做。这样理解对吗
-天南地北-
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08/22/2024 postreply
12:36:30
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I believe so.
-7grizzly-
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08/22/2024 postreply
12:48:59
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thank you
-天南地北-
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08/22/2024 postreply
13:06:25
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I would believe so:-)
-obama_北美101-
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08/22/2024 postreply
17:54:16