The two most common prepositions used after the verb "think" are "about" and "of." They are very similar, but there is a small difference.
Usually when you think of something, it is a brief moment - just a few seconds. It is also used for opinions. When you think about something, you are considering it for a longer time - like a few minutes or more.
Every time I hear this song, I think of my mother.
(thinking for a few seconds)
What do you think of my new haircut?
I'm thinking about moving to a different city.
I still get angry when I think about all the rude things my sister said to me. (thinking for a few minutes or more)
Common error: Don't use "think to" for "considering."
I'm thinking to do an intensive English course in Canada.
I'm thinking about doing an intensive English course in Canada.
Mom is not coming to collect your dirty clothes, so unless you want to smell like a skunk in a trunk, you will have to learn how to operate a washer and dryer. Follow the directions on the laundry soap containers and never overload the machines. In addition, be sure to wait out your laundry cycles keeping an eye on your clothes or your wardrobe may disappear from the dryer and end up on eBay.
Pros: You will have fresh socks each week that match Cons: You will need to schedule a laundry day