Verb conjugation of "allungare" in Italian

We called it the 'Progress Tool' but full course or complete online lessons may have been better terms to describe what we have intended. The website uses special technology and crowd sourcing to enhance the knowledge of each user.
My correction were added and highlighted with yellow markers and attached to this email. Tell me now if you have any questions about grammar rules, since I was a teacher 10 years ago.
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