I sincerely hope this doesn't come across as either rude or patronising - it genuinely isn't meant to. It's also not intended as a pedants' thread.
I just thought it might be useful to list a few common mistakes, with an explanation, so that anyone who isn't very confident with their written English might be able to correct errors which, for example, could perhaps count against them in a job application or when used in a professional context.
I'll start with three:
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"Your" shows that what you're referring to (probably a person or object) belongs to whoever "you" is in the sentence; for example, "Your brother showed me your book". If you mean "you are" you need to write "you're".
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"Non" is not a word on its own - it is negating something, such as in "non-stick" or "non-committal". ("None-stick" would be incorrect, as would "non of them".) "None" means there aren't any. "How many cakes are left?" "Sorry - none." Or, "How many of the children finished the test?" "None of them."
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"Alot" is not a word and the same goes for "abit", "infront", "incase" and "inbetween". Instead use "a lot", etc., just like "a little".
Hope I haven't made any mistakes myself...