1、has用于一般现在时，还有就是说明一般的普遍或者经常性的情况。
She has become a lot more tolerant and communicative.
她变得宽容多了，也爱说话了。
He has fooled a lot of people into believing he is a rich man.
他骗了许多人，让人相信他是个富翁。
2、has只在单数第三人称(he,she,it)或者主语是单个物体时使用。
Beauty is an attitude. It has nothing to do with age.
美是一种态度，与年龄无关。
My husband has several shirts of different colors.
我丈夫有好几件颜色不同的'衬衫。
3、had则用在一般过去时，过去完成时。
He had an operation last year to widen a heart artery
去年他接受了一个扩张心脏动脉的手术。
He had our friend's cap!
他拿了我们朋友的`帽子！
4、had的使用范围比较广泛，在过去时中,任意人称都是had。
I had a coke in the mini-bar.
我拿了一瓶小吧柜中的可乐。
Have you had some training related to telesales in your past years?
在过去的几年中，你接受过电话销售的相关培训吗？