"Is" is the present tense third person singular conjugation of "be".
"Being" is the present participle of "be" ("is" doesn't have its own participle).
Being is the present participle. The past participle is been.
The past participle of do is done. The past participle of have is had.
The present participle is "sowing" and the past participle is "sown".
Present participle - winding Past participle - winded
Begun is the past participle, and beginning is the present participle.
The present participle is beating. The past participle is beat.
The past participle of am is been. Not does not have a past participle
required is the past tense or the past participle of verb require.require / required / required.Use require when making present simple sentences egThey require a ten percent deposit. OR The mechanic requires a ten percent deposit. OR She requires a ten percent deposit etc.Use required when making past simple sentences egThe travels agents required a ten percent deposit. OR He required a ten percent deposit etcUse the past participle required when making present/past perfect sentences egThey have required a ten percent deposit. He has required a ten percent deposit.Last year he had required a ten percent deposit.OR when making a passive sentence egA ten percent deposit is required.
No, the word store is not a participle. The present participle is storing. The past participle is stored.
The past participle is "seen", and the present participle is "seeing".
The past participle is proceeded. The present participle is proceeding.
The present participle is swelling. The past participle is swelled.