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."
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).
Known is the past participle of know. The present perfect tense of know is have/has 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."
The past perfect tense is had set.
The past perfect tense is had rung.
The past perfect tense is had bathed.
The past perfect tense of "confront" is "had confronted."
The past perfect tense of "learn" is "had learned."
The past perfect tense is had burned.