* infinitive: know * past: knew * past participle: known
Past Perfect is formed like this: had + past participle
Past Perfect: had known
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The past perfect tense of "know" is "had known." It is formed by using the past tense of the auxiliary verb "have" (had) followed by the past participle of the main verb (known).
The past tense of "exist" is "existed." The past perfect tense is "had existed."
The past simple tense is knew. e.g. "I knew the answer but I forgot. "The perfect past tense is had known. e.g. "I had known once, but I don't know now."
The past tense of sit is sat. The past perfect tense of sit is had sat.
The past tense of "bleed" is "bled." The past perfect tense of "bleed" is "had bled."