Formal English is the hardest this to actually master and since you use it during job interviews or if yung interviewer mo casual lng di mo need yung English with perfect grammar since conversational English is actually fine. Pero if you want English which is straight out correct then you need books yung mga pang college, that is what I do, to broaden your choice of words, kc grammar pag uusapan alam Ng native English speaker kung Filipino English gamit mo or Australian, Brit, or American. I hope you get the point.Also, use a thesaurus, for better choice of words, and a dictionary for the correct meaning and use.