"LRD Fair enough - but I'll only do one as I'm short on time. Corrections in square brackets
'sittinginthemorningsun Chelsy we're chatting casually on an internet forum, not taking an A level paper
[full stop at the end of a quotation needed here]
Alas, when you receive a letter from the NHS or your local authority containing spelling errors, it does make you doubt their ability to get other things right.
[If I were being a stickler, I'd quibble the punctuation, but it's colloquially acceptable.]
I was thinking more of posts on Facebook though.
[Comma after 'Facebook' needed, and 'however' would be better English.]
Am I the only person to have FB friends (not all with degrees) who post in better English in their second language than quite a considerable number of native English speakers?
[This is badly phrased - your 'better than' needs to be comparing like with like. You've meandered from comparing languages ('better English') to comparing people ('English speakers').]
I have several friends from a country where there is no universal free education
[comma would be good here]
and its
[it is, or it's - you need an apostrophe when you contract]
only available to those whose parents can pay or who benefit from charity, and even then commonly not as long as the English receive.
[receive it? I think you've missed out a word here]
Hope that was actually useful - I would never correct to this level for someone who wasn't happy to be corrected, and some of these, as you can see, are more quibbly than others."
LRD I don't find that helpful at all, as you are obviously scraping the bottom of the barrel to come up with criticisms. The only one I will give you is "it's". The missing "it" is a typo. When quoting someone, its inaccurate to change their usage and I do believe the quote function on here doesn't bold if you add full stops. I would have thought the average educated reader could manage to deduce this. Much of the rest relates to the use of commas and qualifiers which is your personal preference and not incorrect - however if you over-puncuate, as you recommend, you risk changing meaning or reducing clarity.
"however, if you over-puncuate, as you recommended, you risk changing meaning, or reducing clarity"
FGS don't over-use commas! It breaks the flow. If it reads perfectly without it, don't include it.
Please feel free to correct spelling and true errors of grammar, as this can be useful. I don't usually point out spelling mistakes, but I inwardly cringe when I read them note I used but there rather than however in an attempt at colloquiality and I silently applaud the upholding of the English language.