Please explain me with an example all forms of participle under non-finites with an example.I have my SA1 so please reply soon.Also bare infinitive.

A non finite verb is not limited by subject, number, person or tense. In English language, non finite verbs are gerunds, infinitives and participles.

Present participle acts as an adjective and is formed by adding '-ing' to the verb: Her dancing ability was poor.

Perfect participle is made by combining with past participle: Having danced, she sat down.

Past participle can come without a helping verb and act as an adjective: The dance show had a spoken commentary with it.

When the infifnitive is used without the marker 'to', it is called bare infinitive. For example:

Help me open the gate.