INDONESIAN BETRAYAL - When to use
VERONICA SCOTT ABN 41 242 098 943 - EDITING AND PROOFREADING SERVICES
DO YOU KNOW WHEN TO USE:
OF or OFF
YOUR or YOU'RE
PLANE or PLAIN
 
There are many more words which a spellcheck will not show as errors. If you misspell a word, but that word is in the programme's dictionary then it won't have that wiggly red or green line underneath. People rely on these applications, but they aren't infallible.