Question

高中英语语法独立主格结构的时态问题

请问独立主格结构结构除了常见的4种，能否用sb having been doing?.（现在完成进行时）~请给出依据，谢谢

Answer 1

当然可以的！例如：The signal having been given, the train started.(强调时间上有间隔）
又如：Her arm having been badly hurt, she had to go to the doctor.(强调伤在过去）
当然，需要注意的是，在逻辑主语+having been+done的结构中，having been可以省略。
所以以上两句又可以改成：
The signal given, the train started.
Her arm badly hurt, she had to go to the doctor.

Answer 2

肯定是可以的
It having been raining for several days, we had to cancel the trip to Beijing.