Finding out the correct sentence:I don't know why did he leave early, I need not to know why he left early,I should know why was he leaving early, I don't know why he left early.
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Answer:
Finding out the correct sentence:I don't know why did he leave early, I need not to know why he left early,I should know why was he leaving early, I don't know why he left early. I need not to know why he left early.
