say,talk,speak的区别?

简单点说:
say"说",强调说话人说话的内容。say sth to sb
talk“交谈，谈话”强调说话两人之间的对话。talk with sb about sth
speak“说”强调说的动作，不强调所说的内容 。同时，说某种语言是用 speak。speak to sb

say强调的是说得内容
talk主要是表对象（如：talk to, talk with）
speak主要是讲得所说语言

▲ say一般作及物动词用,着重说话的内容,它的宾语可以是名词,代
词或宾语从句.
eg:He can say his name.他会说他的名字.
Please say it in English.请用英语用.
She`s saying ,Don`t draw on the wall.她在说“别在墙上画”.
▲ speak强调说的动作,不强调所说的内容 .作及物动词时,常以某种
语言作宾语.作不及物动词时,常见的搭配形式有：
speak of something/somebody谈到某事（某人）speak to sb 跟某
人讲话,此外speak还可用于在较为正式的场合了表演讲或演说.
Can you speak Japanese?你会说日语吗?
She is speaking to her teacher.她正在跟她的老师说话.
He spoke at the meeting yesterday.他昨天在会上讲了话.
▲ talk 一般为不及物动词,意思是“交谈,谈话,着重强调两具之间的
相互说话.
eg:She is talking with Lucy in English.
她正在和露茜用英语交谈.
What are you talking about?你们在谈论什么?
The teacher is talking to him.老师正在和他谈话.