since done还是since being done?


例:The wall has been like this since being damaged by a bomb. 自从被一枚炸弹炸毁之后,这堵墙就一直是这个样子。

这个句子显然是 The wall has been like this since it was damaged by a bomb 的简化,为什么不能像when、if等引导的状语从句那样省略“主语+be动词”成 since damaged,而是since being damaged?

原因如下:

when、if与since的不同之处在于:when、if只是引导词,since除了是引导词,也是介词。

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