speak强调说话的能力，方式和对象，不强调说话的内容。作为及物动词时，后面一般跟表示语言的名词或代词。而作为部及物动词时，后面一般用介词to.
eg：The young man is speaking Japanese.
The teacher is speaking to his class.
talk强调“谈论”、“交谈”、“谈话”，后面常跟介词to或with搭配，表示“与......交谈”，与介词about或of搭配，表示所谈论的内容。但一般较少用of。
eg：May I talk with you？
What is he talking about？
tell强调“告诉”，“讲述”，一般用作及物动词。
eg：I tell him my home address.
My grandpa often tells me stories at night.
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