tell表“告诉，讲述”，多为及物动词，后面多接两个宾语。

Iwill tell him the news as soon as hecomes back tomorrow.

Granny often tells me funny stories.The policeman told us not to playfootball in the street again.

talk 表“交谈、谈论”,talk 多是不及物动词,常与 with/to/ about 搭配使用再接宾语。如:

They are talking about their friends now.

I will talk to your father about yourhealth next time.

Mr. Zhang is going to give us a talk atthe meeting.

say表“说”作及物动词，后接说话的内容做宾语。

Did you say goodbye to your granny?

speak 表“讲”后接某种语言作宾语打电话时常用它表示说话，也有“演讲”的意思，不强调说话的内容。

We can speak Chinese and English.

May l speak to Henry?

He will speak at the meeting tonight.

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