"How are you？" is a nice question.It's a friendly way that people in the UnitedSates greet each other.But when a person says "How are you？"，he hopes to hear the answer "Fine"，even if the person's friend isn't fine. （1）

G

G

They are common （常見的） ways of saying "Hello" and "Hi".
   Sometimes，people also don't say exactly what they mean.For example，when someone asks "Do you agree？" the other person may be thinking， "No，I don't agree.I think you're wrong." （2）

E

E

It's a nicer way to say that you don't agree with someone.
   （3）

B

B

For example，when a person wants to finish talking with other people on the phone，he may say "I have to go now." Sometimes he gives an excuse （接口）， "Someone's at the door."， "Something is burning." and so on. （4）

A

A

It's a polite way to stop a conversation and it doesn't hurt the other person's feelings. （5）

C

C

This is one way of being nice to people and it's a part of the game of language.

A.The excuse may be real，or it may not be.
B.It's interesting when people want to finish talking.
C.People don't always say exactly what they are thinking.
D.It's hard to know how people want to start a conversation.
E.But it doesn't sound very polite，so they may say， "I'm not sure".
F.When a person doesn't agree with others，it is rude to say it loudly.
G.The reason is that "How are you？" isn't really a question，and "fine" isn't really an answer.