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Past tense is the grammatical term.
Past Tense: A grammatical tense that places an action or situation in the past.
Present Tense: A grammatical tense that locates a situation or event in present time.
Past tense - had.
Present tense - have/has.
Future tense - will have.
it is past tense because of the grammatical tense
A single word does not and cannot have a grammatical structure.The word 'yet' does not have a past tense