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all together-possesive altogether-non possesive example: All together kids
The past tense of "you all graduate together" is "you all graduated together."
were all in this together were all in this together were all in this together
The past tense of the sentence "We all graduate together" is "We all graduated together."
And after the reunion, they all together had a happy life. This is a sentence using all together as a phrase.