I am an American born native English speaking adult, but I still have problems with punctuation and grammar…

I don’t think any language or it’s grammar can ever be 100% mastered by anyone all the time, humans just aren’t built to be perfect.

But I’d try Amazon.com, if not to shop then at least to get some ideas. It might help since many of it’s listed items have reviews by people who have them.

Grammar.

For grammar click a link below.

http://englishplus.com/grammar/contents.htm

http://www.world-english.org/

http://www.webenglishteacher.com/grammar.html

http://dictionary.reference.com/

http://dictionary.reference.com/writing/

http://www.edufind.com/english/grammar/

http://www.funbrain.com/grammar/index.html

http://www.askoxford.com/asktheexperts/faq/aboutgrammar/?view=uk

http://www.drgrammar.org/faqs/

http://www.dailygrammar.com/

http://www.englishpage.com/grammar/

http://www.englishclub.com/grammar/

http://grammar.free-esl.com/

and i think u r good.

u should learn what u have done .i think.