Arjanet

Expresses
1. an action that was completed for a period of time
2. a condition that started in the past and that still goes on in the present
3. use regency or actions that have been recently done

Use has or have plus the past participle form of the verb as in has seen or have bought

Indicate a past action that happened before another past action took place.

Use has plus the past participle form of the verb as in had done or had studied

Indicate an action that will be completed before some definite time in the future.

Use will have or shall have plus the past participle form of the verb as in shall written or will have drawn

Has been
a.Present Perfect Tense
b.Past Perfect Tense
c.Future Perfect Tense