I have deleted your other two threads. Please read the notes I sent when I deleted them.
Your question is quite general and difficult to answer in one thread. Are you referring to both present participles and past participles? Do you have some specific sentences that you are trying to change to sentences using a participle?
two simple sentence may be combined by changing one of the main verbs into a participles a present is used to replace a main verb in the active voice and past participle to replace one in the passaive voice
When two simple sentences may be combined by changing one of the main verbs into a participle. Examples We felt exhausted, We sat down to rest. Feeling exhausted, we sat down to rest.
In first sentence, we was used but in another the subject (we) was removed and feel was changed into present participle.