think about后可以加完整句子，例如：Take a minute to think about how much information you process every day。花费一分钟去想想你每天处理多少信息。
think about
think about含有思考、研究的意思，这里指对他人说过的话进行思考。表示经常思考、研究的意思，一般不和think of换用。
I'll think about your suggestion，and give you an answer tomorrow．我要考虑一下你的建议，明天给你答复。
think of
在有关心、为...着想的意思，经常关心他人。表示打算、想出、关心等意义，一般不与think about互换。
Helen，are you thinking of marrying Tom？海伦，你打算和汤姆结婚吗？
Lei Feng was always thinking of others．雷锋总是为别人着想。
think over
意为“仔细考虑”。Think over，and you'll find a way．仔细考虑一下，你就会有办法的。
We need several days to think this matter over．我们需要几天的时间把这件事情仔细考虑一下。