Yeah, good advice, teach him how to speak proper english while you are feeling helpful...

Learning a different language is not simple and for most people requires years just to be able to make your points understandable, as much as i consider english grammar a walk in the park compared to italian grammar, it's still not easy and even just the common colloquial vocabulary, contains an enormous amount of words to memorize, translate and learn to apply in the right context. Please, don't give advices like that, as good as your intention may be, it's never going to come out as anything better than rude.
Besides, i'm not sure how "building" or "constructing" something would help him be more understandable, so i'm gonna guess you meant "write".