Perfect tenses are important because they signify the completion of the action or state of being signified by the principal verb of the tense, considered together with all of the parts of the complete predicate. The simple present tense, for example, is properly used for habitual actions that are likely to be repeated in the future, as well as referring to the present only. For example, the sentence, "Almost everyone in this house speaks English" can be true and have correct grammar, even if it is written by a silent person when no one in the house is actually speaking at all. Using the present perfect negates any inference of such habitual recurrence, while using the present progressive (sometimes called "present continuous") excludes any expectation of the writer or speaker that the action will not be continuing in at least the immediate future.
Similarly, using the simple past tense or simple future tense signifies that an action or state of being occurred in the past or will occur in the future, without any implication about whether that action or state of being completed anything, or a phase of anything, important to the speaker or writer. Using the past perfect or future perfect tense signifies some such completion.
Past perfect tense - I had dug. Present perfect tense - I have dug. Future perfect tense - I will have dug.
Past perfect tense, past perfect continuous tense, present perfect tense, present perfect continuous tense, future perfect tense and future perfect continuous tense.
The tense that uses "had" is the past perfect tense, while the tense that uses "have" is the present perfect tense.
Was is a past tense conjugation of be. The present perfect tense of be is have/has been.I/We/You/They have beenHe/She/It has been
Existed is the past tense. The past perfect tense is had existed.
present tense past tense future tense present perfect tense past perfect tense future perfect tense present progressive tense past progressive tense future progressive tense present perfect progressive tense past perfect progressive tense future perfect progressive tense
Past perfect tense - I had dug. Present perfect tense - I have dug. Future perfect tense - I will have dug.
Present Tense, Paste Tense, Future Tense, Future Perfect Tense, Present Perfect Tense, Past Perfect Tense
Past perfect tense, past perfect continuous tense, present perfect tense, present perfect continuous tense, future perfect tense and future perfect continuous tense.
Present perfect tense - have/has gone. Present perfect continuous tense - have/has been going. Past perfect tense - had gone. Past perfect continuous tense - had been going. Future perfect tense - will have gone. Future perfect continuous tense - will have been going.
The tense that uses "had" is the past perfect tense, while the tense that uses "have" is the present perfect tense.
Was is a past tense conjugation of be. The present perfect tense of be is have/has been.I/We/You/They have beenHe/She/It has been
Existed is the past tense. The past perfect tense is had existed.
The past perfect tense is "had confronted".
The past perfect tense is had chosen.
The past perfect tense is had burned.
The past perfect tense is had set.