say和talk有什么不同？？谢谢！！讲的通俗一点吧！！

say 一般侧重说话的内容,也就是后文一定要有所说内容;
talk 一般侧重与交谈,指双方的互动过程.
eg.
He says good bye to us.
We are talking about our lessons.
He talked with me this morning.

say更加宽泛一些
talk更多的表示对话啊之类

say强调说话
talk为交谈

say [简明英汉词典]
v.说, 讲, 背诵, 念, 表示, 比方说, 假定
n.话语, 想说的意见, 发言权

talk [简明英汉词典]
v.谈话, 讲, 谈论, 议论, 说服某人做某事
n.谈话, 会谈, 讲演, 讲话

say 侧重于说话
talk侧重与谈论...