Have known is correct.
The correct phrase is "have known." "Known" is the past participle form of the verb "know" and is used with the auxiliary verb "have" to indicate a completed action in the past.
No. "I could have gone with you if I had known your schedule." Or "If I had known your schedule, I could have gone with you." Your verb tenses are incorrect in the original, and you need to use "if" to set up the condition.
The correct phrasing should be, "I didn't know that." The past tense of "know" is "knew," so using "knew" in this context would be incorrect.
Could be "know, knows" but also the simpler "knew, knew" or even the perfect tense "had known, knew" -- the tense is so undefined that you would have to choose from a number of distractors.
The simple past of know is knew. I was sure I knew how to get to the museum.The past participle is known. I have known Mary for ten years.
The irregular verb form of "knew" is "known."
That is the correct spelling of the phrase "I knew that" -- synonyms for known are understood, comprehended, and recognized.
Compare these sentences using know / knows, knew and known: CORRECT: Present tense: I know the answer. I knew the answer. They know the answer. Past tense: He / She knows the answer. He / She knew the answer. They knew the answer. Known requires a helping verb, a form of 'be' in had or have. Correct: I had known the right answer. He / she had known the right answer. They should have known the answer. Though I should have easily known the answer, I did not know what I knew.
No, the correct phrase is "he knew winter was coming." The word "had" is unnecessary in this sentence.
Yes, that is correct.
No. "I could have gone with you if I had known your schedule." Or "If I had known your schedule, I could have gone with you." Your verb tenses are incorrect in the original, and you need to use "if" to set up the condition.
She knew the correct answer was 5, but she didn't care.
The correct phrasing should be, "I didn't know that." The past tense of "know" is "knew," so using "knew" in this context would be incorrect.
Could be "know, knows" but also the simpler "knew, knew" or even the perfect tense "had known, knew" -- the tense is so undefined that you would have to choose from a number of distractors.
It Must Be "I Knew About This Long Ago".
It's not completely correct. Since the sentence is referring to the past, the correct way to say it is "I knew that the plane would crash." And all sentences have to start with a capital letter.
The simple past of know is knew. I was sure I knew how to get to the museum.The past participle is known. I have known Mary for ten years.
The irregular verb form of "knew" is "known."