The modals as verbs must, can, could, may or might is used to express a
judgment about the probability that particular situation or not happen.
- We use must, could, might, may and can't + be to talk about degrees of certainty.
Must: almost 100% sure it is true
May and Might: used to say that anything can happen in the present or in the future.
May not and Might not: It is a bad thing that can happen.
Could: It expresses a more theorical or permanent possibility of something happening.
Couldn't: It means it is impossible for something to happen.
Can't: almost 100% sure it is not true
Example:
I must stop and rest. I'm driving for more than four hours.(I'm almost 100% sure it is true)
Jack must be home. I heard a noise coming from is room.
We might go to London next week. (I'm not sure if it is true)
She might be at home by now but it's not sure at all.
I can't go to the party because I don't feel well. (I'm almost 100% sure it is true)
Your brother can't be in USA. She's flying on an airplane.
Opinion:
In my opinion this kind helps us much to use good manners verbs for my serve me well.
I hope that others will also serve them.
