think单独使用时表示“思考”,接that宾语从句时意为“认为、觉得”.
如：He is thinking how to work out the problem.他在思考如何解这道题.
I think I'll take it.我想我会买.
当think后面的宾语从句含有否定意义时,通常形式上否定 think但意义上却是否定宾语从句.
如:I don't think it will rain.我认为不会下雨.
think of意为“考虑到、想到” 后常接代词、名词或动词-ing形式,意为“认为”时,一般用于疑问句中与what连用.
如：It's good to think of the future.考虑到未来是对的.
He thought of a good plan.他想到一项好计划.
What do you think of the play?