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Hello,

Both must and have to are used for obligation and necessity.

I am confused about "obligation".

What does it mean?
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Comments  
An obligation is a duty. It is some action you are required to do.

Suppose that your boss said "Hanuman, Mr. Brown is coming to town to visit our company. Go and meet Mr. Brown at the train station"

You can say:
It is my duty to meet Mr. Brown at the train station. (because my boss assigned this task to me)

Or you can say:
It is my obligation to meet Mr. Brown at the train station.

Or you can say:
I have an obligation to meet Mr. Brown at the train station.

Or you can say:
I have to meet Mr. Brown at the train station. (This leaves out the words "an obligation" but it means the same thing.)

Or you can say:
I must meet Mr. Brown at the train station.

There are lots of ways to say the same thing! People almost always use one of the last two above - have to or must - to express this idea of duty or obligation.

CJ
Hello Mr.C.J

Wondeful explanations. Thanks a lot.
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but jim, where does the difference between "must" and "have to" lie then? as far as I know "must" expresses an internal obligation and "have to" an external one. Here, can "meeting the boss at the station" be an internal obligation. Not likely, I think. Why do you (native speakers) use must in this case then? Can you give me an example in which one is possible and the other not? Can we use them interchangeably?
Diamondrgbut jim, where does the difference between "must" and "have to" lie then? as far as I know "must" expresses an internal obligation and "have to" an external one. Here, can "meeting the boss at the station" be an internal obligation. Not likely, I think. Why do you (native speakers) use must in this case then? Can you give me an example in which one is possible and the other not? Can we use them interchangeably?
Check out this link "has to" as a helping verb? on the Linguistics forum.
thank you, Milky.
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thank you, Milky.

by the way, what does Milky mean? does it have to do anything with milk?

If yes, what is the meaning of milky in "the Milky Way"?
Milky
[Check out this link "has to" as a helping verb? on the Linguistics forum.

but it seems you haven't come to an agreement. and by the way I notice that I have made a mistake above. it should be like: "has to" is used to express internal obligations, and "must" for external ones. but I think this is too general a rule to explain all uses of them. some grammars say that in some situations both of them are acceptable. but what I wonder when they are both acceptable. are there cases inbetween? that is , between internal and external obligation.

- Students in most countries must wear uniforms to school. ( not have to)

- I must tell her that her husband has been deceiving her. (here I think the speaker has an inner urge to tell that, so must is not acceptable)

am I right?
Diamondrgthank you, Milky.

by the way, what does Milky mean? does it have to do anything with milk?

I have white hair.
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