Three types of non-finite clauses:
infinitive clauses
to infinitive
bare infinitive
present participle clauses
past participle clauses
1). Past participle can function as adverbials
*{When they were awakened by the unusual noise}, the dogs began to bark.
Finite DC: Advl. of time
{Awakened by the unusual noise}, the dogs began to bark.
Past participle/-ed clause: Advl. of time
{The task finished}, we returned home.
Past participle/-ed clause: Advl. of condition
{Seen from this perspective}, the problem presents no easy solution.
Past participle/-ed clause: Advl. of condition
*Note that in a past participle clause, the relationship between the verb ("awakened") and the subject ("the dogs") is passive.
2). Past participle function as PNM
The results {displayed in Tables IV and V} suggest that the treatment group outperformed the control group.
Past participle/-ed clause: PNM
Similar to relative clauses, a past participle clause can be restrictive or non-restrictive:
a. Restrictive past participle clause:
The lone Romulan warship crippled by photon torpedoes drifted slowly toward the asteroid.
b. Non-restrictive past participle clause:
The lone Romulan warship, crippled by photon torpedoes, drifted slowly toward the asteroid.
Ex. 12.10, 12.11, 12.12 (pp. 392,393, 394) (optional)
Can you find where the author used past participle clauses?