Ex: I shook hands with Edward. I had shaken hands with Edward.
Both sound a bit awkward to me, as well as "I shaken hands with Edward."
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1. I shook hands with Edward. I don't see anything wrong with this sentence. We use it to talk about a past event.
2. I had shaken hands with Edward. This one certainly has a problem standing alone. To use the past perfect tense, we need to relate it to another past event that came after.
3. I shaken hands with Edward. This one is not correct.
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had shaken is past perfect tense. I had shaken hands with Edward before I shook hands with Steven.
The past participle of 'shake' is 'shaken'.
Simple Past I shook hands . . .
Present Perfect I have shaken hands . . . (There's nothing wrong with saying this.)