Confusing Words
THINK OF vs THINK ABOUT
Think OF = bear in mind/take into account/think quickly/consider (usually works as a stative verb = can’t be continuous)
– Think of the teachers who only have 12 weeks holiday a year (bear this fact in mind/Have a thought for)
– Do you remember that tall guy with a beard and glasses, I can’t think of his name… oh yes, Sarah! (can’t remember)
– Come to think of it, I am busy this weekend, so no, I can’t meet you. (consider)
– Think of a number between 1 and 10…. F! (think quickly)
Think ABOUT = consider/contemplate/ponder (often in the continuous form because it is a longer thought process)
– I am thinking about what to have for dinner… emmm… fish and chips… or…. emmm… or maybe two portions of fish and chips! (longer consideration)
– I like sitting on beaches and thinking about my existence. (pondering)
BUT… “opinion” (the meanings are almost exactly the same)
-What do you think OF my plan? Rubbish!
-What do you think ABOUT my plan? Emmmmmm… emm.. rubbish!
BUT (2)… You might see on greeting cards:
Thinking of you – Thinking about you
(because we are using the continuous form here, thinking OF now means thinking ABOUT. This is something I believe native speakers of English have confused over the years and it has crept its way into everyday use… blin!)
Compare:
Think of me when you are on holiday! (ok) Think about me when you are on holiday! (ok) I will think about your offer! (ok) 
I will think of your offer! (wrong) 
Commonly Confused Words 
CALL vs CALL TO
COMMON MISTAKE: ON TIME or IN TIME?