However, unlike couldn’t and can’t, which are normally contracted, must not is usually written as two words. Must not also conveys a strong feeling that something is not probable nor possible. Using “must” conveys a strong feeling of certainty nevertheless, there is still some doubt in the speaker’s mind.Ĭould, may and might show that a speaker is 50% or less certain about a present situation.īy using couldn’t and can’t, a speaker shows that he believes a situation is very unlikely or impossible. Must, could, might, may, couldn’t and can’t are used to show how possible or probable the speaker thinks a present situation is. Do you think it might rain tonight? It might.We ask a question in a different way with modals of possibility.
I might not come by your house this afternoon.I might come by your house this afternoon.
