Present perfect is formed by combining have/has with the main verb’s past participle form:
I have arrived. A negation is produced by inserting not after have/has:
I have not arrived.Questions in present perfect are formulated by starting a sentence with have/has:
Has she arrived?
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
The pattern :
(+) 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?
Adverbs used :
from 1998 to 1999, once, twice, etc.
This under text from : http://en.wikipedia.org/wiki/Future_perfect_tense
Future Perfect Tense is used to describe an event that has not yet happened but is expected or planned to happen before another stated occurrence.
The pattern :
subject + shall or will have + past participle of verb
Example :
I shall have gone to the store by the time you come
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