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.

Is importand know the modal becouse you can used of direferent way ,They have not past or future and do not take the - s in the third person singular in present simple.
ResponderEliminarIts publication is important so we could express in a correct manner in true facts and false.where we modal verbs
ResponderEliminarThanks friend for your explication. It's so important to me and for all the students. Yor information is interesting and so reliable. Your contribution is valuable for people who do not understand the topic, thanks.
ResponderEliminarThanks for the info, it helped me a lot to know how to properly write the modal verbs in sentences, and thanks to your help I can saver use and meaning.
ResponderEliminarExcellent Friend....
ResponderEliminarvery good explanation is presented of the modals verbs: must be, may be, might be, could be and can't be. It helped me a lot this blog, for its detailing how to use those the modals verbs