I was discussing with a friend about possibilities and he told me:

When you have more certainly you should use "will" instead of "may",

but I am not sure if the word "certainly" can be used like this, I would like to appreciate any explanation of its usage, I got confuse since I believe that this word can be used in many ways, I am not sure if it is a verb or an adjective.

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    You're probably using the wrong word. Almost certainly (though I can't say with absolute certainty) you don't want the adverb certainly at all - you should be using the noun certainty. Jun 30, 2016 at 14:23
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    Yes I agree maybe I got confuse since both sounds very similar.
    – neo33
    Jun 30, 2016 at 14:27
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    It depends on what you mean. Your exact text as written above (putting aside pedantic matters like whether it should any commas) could validly be interpreted as meaning It is certainly true that when you have more you should use [blah blah] Jun 30, 2016 at 14:39

1 Answer 1


I think the noun you are thinking of in your sentence is


which is a measure of the probability that something will happen

When something happens with certainty, it has a probability of 1.0


is the adverb to describe certainty.

If something has certainty, it will certainly happen.


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