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The past participle (and simple past) is left.
the past and past participle of leave is:
LEFT
The past tense of "have" is "had" and the past participle is also "had."
The past tense of "shake" is "shook" and the past participle is "shaken."
The past tense of "saw" is "sawed" and the past participle is also "sawed".
"Dared" is the past tense and past participle of "dare".