If we see a large grey cloud in the sky, a possible guess is that it is going to rain-maybe. If we see a man in police uniform, a reasonable deduction is that he is a policeman. So as you also said when we have evidence that percentage will definitely go up.Deduction (noun): guess reaching a conclusion by reasoning and logic, based on evidence I think this is the simple way of learning the difference and if we try to draw a line between likelihood & probability (according to percentage-wise as I did in the past the situation will become more complicated.). When you got lost in the forest (evidence) you must have been very frightened There's no food left (evidence) - we must have eaten it all. Harry's been driving all day (evidence) - he must be tired. I carefully examined the sentences with must and almost always they have some evidence to offer.
īut as set16teddy explains the difference doesn’t have anything to do with Probability or Likelihood but it has something to do with evidence. Likelihood = if something is likely it has a chance of happening but it is not as strong as with probability say if we put them on a scale it may have 70%. Probability = If something is probable it has a better chance of happening say if we put them on a scale it may have 90% Thank you very much for the explanation and your thoughts and I was also under the impression that must refers to probability but will refers to likelihood. Members I would like some help to differentiate between will & must in this context or if they are the same can interchange them as below.Įg. Their goal keeper must be at least two meters tall.Įg. We use “must be” or “have got to be” in informal speech.Įg. To draw a conclusion about a present situation.You will know that John and Sandra are engaged. We can use will to draw conclusions or state assumptions about things that are the case now.Įg.The statements & examples below are from “Cambridge Advanced Grammar In Use Book” and “Oxford dictionary.”įrom “ Cambridge Advanced Grammar In Use Book”. This question is about drawing conclusions by using will & must.
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