sounds like a humorous letter because the superficial in most of us get trapped in mocking the wrong grammar and things like that.
but pause to ponder for a little while, and think about the efforts of trying hard to come up with an explanation, an excuse letter why he was absent.. using a language he obviously lacked skill of..but he has shown excellent example of responsibility.
In graphology, the handwriting shows a person of balanced mindset, un emotional, rather logical..his t's are well crossed...etc. Just sharing.