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The past tense of "alone" is "alone." The word "alone" does not change when expressing past tense.
Alone - Why Must I Be Alone - was created in 1964-05.
He worked alone, lived alone and did everything alone.
Let alone
Usage of "alone" in a sentence:
"I am alone in this world."
"Are you alone?"
"Bethany felt alone because no one else was at her party."
"Tyler wanted to be left alone but Kelly wouldn't leave him alone."