Present Perfect Tense is used for describing a past action’s effect on the present: He has arrived. Now he is here. This holds true for events that have just been secluded as well as for events that have not yet occurred.
Rumusnya Present Perfect Tense:
(+) Subject + have/has + V3
(-) Subject + have/sas Not + V3
(?) Have/has + subject + V3
Example:
(+) She has gone (Dia baru saja pergi)
(-) She has not gone
(?) Has She gone?
(-) She has not gone
(?) Has She gone?
Past Perfect Tense is a kind of tense that is used to describe an action or an event that started in a certain time in the past and completed or finished till certain time in the past too; or past perfect tense is used to express an action or an event that had happened before the other event or action happened.
Rumusnya Past Perfect Tense:
(+) Subject + had+verb III+cmplement
(-) Subject + had not+ver III+complement
(?) Had + subject +verb III+complement
Example :
(+) We had eaten before they came
(-) They had not eaten before we came
(?) Had they eaten before we came?
(-) Subject + had not+ver III+complement
(?) Had + subject +verb III+complement
Example :
(+) We had eaten before they came
(-) They had not eaten before we came
(?) Had they eaten before we came?