persuade & convince 两者都表示“说服”、“劝服”。在用法上有所不同。

convince用作及物动词，主要意思是“使信服”、“使确信”，指通过讲道理、摆事实使人在理性上对问题具有认识或表示信服，后面可跟从句，of 引起的短语，人称代词和名词。例如：
She convinced me that her father was innocent.她使我确信她父亲是无辜的。
I convinced him of her honesty.我使他相信她是诚实的。
I am convinced of his mistake. 我确信他是错的。=I am convinced that he is mistaken.

persuade也用作及物动词，主要意思有“说服”、“劝服”、“使某人相信”，主要强调用说明、恳求、诱导等方式影响一个人的感情或愿望，着重通过说服某人不仅在思想上接受，而且付诸于行动。例如：
I persuaded him of my innocence.=I persuaded him that I was innocent.
我说服他相信我是无辜的。
I persuaded him to stop smoking.我劝服他戒烟。=I persuaded him out of smoking.
Try to persuade him to let us go with him.试着说服他让我们跟他去。


reject & refuse 这组动词都有"拒绝"的意思。

decline v.婉言拒绝，谢绝，相当于refuse politely，主要用于拒绝有关社交活动的邀请或要求帮助的请求，后接名词或动词不定式，主语只能是人。

I invited her to join us, but she declined.我邀请她和我们在一起，可是她婉言谢绝了。

refuse v.是比较普通的用词，表示"拒绝"，含有非常坚决地、不客气地拒绝的意思。

reject v.抛弃，不采纳，主语可以是人或物，后接名词，不能接动词不定式。

He asked her to go to the movies three times, and each time she rejected him.他三次约她去看电影但每一次都被拒绝

deny v.否认，否定，其后可接名词，代词或that从句。

The defendant denied the accusations made against him in court.被告在法庭上否认了对他的指控。