哪位高人能指点下"tell"&"ask"的区别?

上节课外教恰好说到这个区别，他说tell sb.to就是对方比较命令式的口气，例如：you drive with me to the airport.我们向别人陈述的时候就说，He told me to drive with him to the airport.而ask sb.to就是会加些客气的词，比如：Can you drive with me to the airport,please?那么我们在陈述这句的时候就可以说成，He asked me to drive with him to the airport.
不对的地方还请各位指证。

tell
[tel]
vt.
告诉, 说, 吩咐, 断定, 知道
vi.
讲述, 泄密, 告发, 表明, 作证
n.
讲的事, 传闻
ask
[B:sk]
vi.
询问, 问, 要求
vt.
问, 要求, 需要, 邀请

tellKK:[]DJ:[]vt.1.告诉;讲述,说[O1][O5][O6][(+about/of/to)]He told us how the accident happened.他告诉我们那次事故是怎么发生的.She told me that she would be back in an hour.她告诉我她一个小时内就会回...