think的第三人称单数形式thinks。think可作名词、动词和形容词三种词性，基本含义除了“认为、想”之外，还有“思索”、“琢磨”、“想法”、“思想方面的”、“供思考的”等意思。
think的意思及用法
think主要用作名词、形容词、及物动词、不及物动词，作名词时意为“想；想法”，作形容词时意为“思想的”，作及物动词时意为“想；认为；想起；想像；打算”，作不及物动词时意为“想；认为”。例句有：
1、What in the world did they think they were doing?
他们到底认为自己在做什么？
2、I think we should go back to first principles.
我认为我们应该回到基本原则上。
3、Their family has always been well thought of around here.
他们家在这一带一直颇受敬重。
4、I don't think you realize how important this is to her.
我认为你没有意识到这对她是多么重要。
5、I think you should go back to your original plan.
我认为你应该回头执行你原来的计划。
6、It was a difficult situation, when you think about it.
仔细想来，当时处境是很困难的。
7、He'll never come round to our way of thinking.
他绝不会改变观点与我们的想法一致。
8、You can't stop people from saying what they think.
人们怎么想就会怎么说，你阻止不了。
9、Just think how nice it would be to see them again.
试想一下要是能再见到他们该有多好。
10、The decision was based on emotion rather than rational thought.
这个决定不是基于理性的思考而是基于感情作出的。
11、I'd never have thought of that in a million years.
我永远也想不出这个主意。
12、I think the problem can be got over without too much difficulty.
我认为这个问题不太难解决。
