WHICH WORD?

to think about to think of

This is difficult to explain, and more difficult to understand and use correctly.  

​The short explanation is below.

Don’t say “I’m thinking to buy a new car.”
​
The correct way is “I’m thinking about buying a new car.”

LINK

to think about + verb + in

​doing something - action, opinion

​This is used the most.

  1. What are you thinking about?
    Sales!  They are way down.

  2. I hate my job.  I'm thinking about joining the Army.

  3. He has been thinking about getting a job with Google in Mountain View; their HQ.

  4. If you are thinking about leaving medical school, I'd think twice.
to think of + noun, noun phrase

​someone or a situation - considering, feeling
​Used less than "to think about"
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​
  1. What do you think of my new hairdo? I love it!

  2. I was thinking of my Mother.  She died a year ago today.​

  3. I feel sad.  I was thinking of all the poor kids in Syria.
    ​ 
  4. Have you been thinking of me?