Common GRAMMAR / SPELLING Mistakes Tagalog Romance Writers Make
FYI.  Refrain from making these mistakes if you can... :-)
*.Excessive use of exclamation points (!) and ellipses (...)
*.Misuse of 'NG' and 'NANG': NANG - when, once
- same as  'noong'
- synonymous to 'upang' or 'para'
- na + ng
- more or  anymore
- used as an adverb of manner
- ligature for  repeated words (ex: tawa nang tawa)
NG      - of
*. Interchanging BUKOD and MALIBAN BUKOD - aside from
MALIBAN - except
*. Switching KUNDI and KUNG DI KUNDI - but
KUNG DI - abbreviated  'kung hindi'  ; if not.
*.Misuse of MALUWAG and MALUWANG MALUWAG - loose
MALUWANG - wide, roomy
*. Interchanging: YOUR and YOU'RE
ITS and IT'S
HE'S and HIS
LOOSE and LOSE
LEAVE and LIVE

Source: http://onheroesandhappyendings.blogspot.com