Past, Present, Future Participles

When are paticiples mainly used, and how would you use them in a sentance?

[Tdol]

Present particle- the form of the verb ending -ing when used as a main verb or an adjective:
I am writing to you. (verb, with auxiliary verb 'be')
It was an interesting film. (adjective)
NB- A gerund has the same form, but functions as a noun or after a preposition, etc.
Past particple- the -ed form (if regular) used with the auxialiary verb 'have' for perfect forms or 'be' for passive forms:
I have finished. (have + past participle)
It was done yesterday. (be + past participle- passive voice)
There's no future participle.