participle subject advice needed

Hi And thanks for reading this post.
I am trying to find the reason for errors in writing.

Being a guy, *it is hard for him to understand her point of view.
Having heard this before, *her patience was wearing thin.
Being very rational, *speaking frankly was a very important to him.
Wounding like an arrow, *he sometimes hated to hear the truth.
Mentioned as constructive criticism,*there were no hard feelings.

 The explanation is: When a participle clause is placed before a clause, the understood subject of the participle clause should be the same as the subject of the main clause. An error commonly occurs with a main-clause subject it or there, as shown

Can you please explain the rule involved here and how to correct it. I have no idea.


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