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A lot of kids don't bother learning proper spelling and grammer because if they do write, they automatically get corrections from word processing programs.
I have always had teachers who insisted on correct grammar and spelling. Also after summer vacation when you went to the next grade the teacher used to ask us what we did on our summer vacations and some said something like I and my friends, or I an my brother etc, the teacher corrected the student and said never say I first, the correct grammar is my friends and I, or my brother and I etc