Having read the report, Hyde breathed a sigh of relief.
I have some questions regarding the part in bold.
- I know it takes the role of adjunct, but what is it called? A gerund-participle clause, or a perfect gerund-participle clause?
- Is Have still an auxiliary for perfect aspect or is it simply used to show which action happens first?
- is Reading the report, Hyde breathed a sigh of relief. grammatical?
- If I want to paraphrase the adjunct to a modifier of the subject Hyde, which one is grammatical? I think a is ungrammatical but I don't know why.
a. Hyde having read the report breathed a sigh of relief.
b. Hyde reading the report breathed a sigh of relief.
c. Hyde, reading the report, breathed a sigh of relief.