Combine the pairs of sentences by using participles present/past: I found the door open. I went inside.

I found the door open and went inside.

The door was found open, and I went inside.

Found the door open, I went inside.

None of these

Participle (Past) Used: "Found" (from "I found") is a past participle that introduces the reason for the action.

Structure: The participle phrase "Found the door open" modifies the subject "I" and explains why the action "went inside" happened.