说：speak/talk/say/tell
这四个词都有“说话”的意思，就像“一家子”，但有区别：
[speak]：只是表示“说”、“说话”，或发出话语的声音，而不管内容是什么。如：
She is speaking to the assistant.
You speak English.
[say]：不仅表明“说”，而且是有内容的，在直接引语或间接引语前后，通常都用say ，如：
He says hev's going to help me .
“I won't come .”said Tom .
It's hard to say who it was.
[tell]：它的意思是“告诉”，即传达给某人关于别的事情，如：
The next day in school, she told Tom about the note .
[talk]:意思是“交谈”、“谈论”，一般指相互间的谈话，且没有一定的内容。有时要谈到关于某人某事时，后接介词 about 或 of ，（还可作名词）如：
In the bus we sat together and talked.
We offen talk about our work and study.
I had a long talk with her.
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