A thought about B thought of C tought for D thought 这四个怎么区分和

thought1 [θɔːt]
n.
1.思想；思索；思考
2.考虑；深思
After much thought he decided not to buy the car.
经过仔细考虑后他决定不买汽车了.
3.想法；看法；观念；念头
She's a quiet girl and doesn't share her thoughts.
她是个内向的女孩,不表露她的想法.
4.思潮；思想
Ancient Greek thought
古代希腊思想
5.（常与of,to连用）留意；注意；关怀；悬念
The nurse was full of thought for the sick men.
那护士非常关怀病人.
6.（前面与a连用）少许,一点