speak讲语言
talk交谈,聊天 talk to sb/talk sb about sth
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.