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Have is present tense. The past tense is had.
There is a past, present, and future. There was a past; there is a present and there will be a future.
what is present past
past: I did, you did, he/she/it did; present: I do, you do, he/she/it/does
"Have" is used in the present perfect tense.
past: I was; you were; he/she/it was present: I am; you are; he/she/it is
Past - was and were. Present - am, is and are.
Present tense: are Past tense: were
"Leaving" can be both a present participle and a past participle. As a present participle, it functions as part of the progressive verb forms (e.g., "I am leaving"). As a past participle, it is used in perfect verb tenses (e.g., "I have left").
Present tense - am, is and are. Past tense - was and were.
"Have" can be used as both a present tense verb (e.g., "I have a book") and a past tense verb (e.g., "I had a book").
The past and present have an interdependent relationship. The present relies on the past and the present shapes the future