Grammar: Might vs Must?

Could you explain the difference between the use of "might" and "must"? How do you use them in context?

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Apr 24, 2011
Might vs Must
by: Ola Zur


Well, there is a big difference between these two words.

"Might" typically shows POSSIBILITY. Meaning, it is possible for something to happen. The word "may" also shows possibility, but "might" is a bit weaker.

Here are some examples:

It might rain tomorrow. (Meaning: it is possible but I'm not sure at all.)
He might come and visit us on Sunday.
This might not be such a good idea.

Now, "must" has several meanings, which are different from the above.

1. "Must" shows that you have to do something. It is your obligation.
For example: You must pay your taxes. (Meaning: you have to pay your taxes. You have no choice.)

2. "Mustn't" (must not) shows that you are not allowed to do something.
For example: You mustn't be late. (Meaning: you are not allowed to be late.)

3. "Must" is also used to show that something is a logical conclusion.
For example: He left 2 hours ago, and it takes 30 minutes to get there, so he must be there already. (Meaning: it is logical that he is there already.)

Click here for more data on the English Modal Verbs.

Ola Zur is the editor of, an illustrated guide to English.

Apr 20, 2011
Must, Might
by: Selma

There is a gradation between them. It's from possibility (Might) to obligatory (Must),
Such as jugment and guess, it is used in many forms.

These comments allow us to brush-up our minds.

Thank you.

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