I am.
In the sentence, if 'am' means 'exist', is the sentence meaningful?
I think writing the term "I am" then be silent like that without a question being asked or adding more sentences wouldn't make your term complete nor clear. Because it would make the other part or listener wonder " You are what? complete your sentence " The listener would think that you maybe wanted to say:" I am fine" or " I am here" or" I am a student" or" I am happy"or "I am beautiful" etc.
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I think writing the term "I am" then be silent like that without a question being asked or adding more sentences wouldn't make your term complete nor clear. Because it would make the other part or listener wonder "You are what? complete your sentence"