Way back in high school, I asked my English teacher a question while we were on the topic of sentence fragments.   If the words "I am." make a complete sentence, then would the contraction "I'm" be a full sentence too?  She was not able to answer me. Hopefully someone here can change that.  Note: Before someone marks this as duplicate to this:   I want to say that this question asks if a contraction by itself can be a full sentence or not.
One can contract I have to I've when have is a helping verb, e.g.     I've got an octopus in my pants.   Is contracting the main verb technically incorrect or merely antiquated? My father loves to say,     I've a month-old smoked shoulder I can cook for dinner,   and he sounds like a crazy old man when he does. I would like to know if I can shut him down by informing him that he is incorrect. :)
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