Hey Native speakers! Come and help us! Part 3

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702名無しさん@英語勉強中
The imaginary story "Writing With Banana!?"

Joe: If you believe that this banana would be a pen, it certainly is a pen.
or(If you believed that this banana were a pen, then it would certainly be a pen.)         
Joe: We call this a pen [or"pen"] in my home.
Ken: I guess I could write a letter only with this banana.
or(Only with this banana, I guess I could write a letter.)

Will you please correct errors if any. (This and the following sentences, too.)
and, Please tell me if there were better expressions than these.

Thank you.