think既可以引出直接引语，又可用于被动结构。
think 过去分词是 thought 。
be thought to (be) do ：“被认为。。。”的意思。如：
She is thought to be the most beautiful girl in our class.
例句：
He was trying to think what to do.他在努力想办法。
I always think about her when it snows.每当下雪的时候，我总是想起她。
He was almost too sleepy to think any more.可是他太困了，再想不起什么了。
I was just thinking what a long way it is.我刚才在琢磨路途太远了。
