“a” vs “an”
"affect" vs "effect"
"canceled" vs "cancelled"
"center" vs "centre"
"cleanup" vs "clean up"
"enrol" vs "enroll"
"ethics" vs "morals"
“i.e.” vs “e.g.”
"learned" vs "learnt"
"practice" vs "practise"
"reborn" vs "rebirth"
"realise" vs "realize"
"suit" vs "suite"
“who vs “whom”
Therefore, hence, so, then, thus
Ms, Mrs, Miss?
Needle in a haystack
Rearrange the deck chairs on the Titanic