Participle clauses are used in order to express condition, reason, cause, result or time and they are used instead of full adverb clauses.
Used wisely, this book should help you prepare for the exam.
If it is used wisely, this book will help you prepare for the exam.
Walking up the hill, I saw Mary.
As I was walking up the hill, I saw Mary.
Painted, the house will look much nicer.
If the house is painted, it will look much nicer.
Participle clauses and conjunctions
Participle clauses can be combined with various conjunctions to from reduced adverb clauses. (when, while, before, after, on)
After considering the offer carefully, we decided to turn it down.
After having driven for five hours, we needed a break.
While walking down the hill, I saw Mary.
On hearing the news, she burst into tears.
The use of perfect participles:
If we want to show that an action happens before another action we use a perfect participle for the action that happened first.
Having seen the film before, I decided not to go to the cinema.
Having been nominated for the Academy Award an astonishing 17 times, Meryl Streep is considered by many movie reviewers to be the greatest living film actress today.
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