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Japanese Certainty & Inference
Might, probably, should be, must be, obviously. Japanese grades confidence far more finely than English does, and picking the wrong rung changes how sure you sound. に違いない weighs evidence, に決まっている appeals to common sense, and とは限らない punctures a generalisation without denying it.
5 grammar points
に違いない | Must Be and I'm Certain in Japanese
Must be; I'm sure that; there's no doubt
に決まっている | Obviously and Bound To Be in Japanese
Bound to be; obviously; of course it is
とは限らない | Not Necessarily in Japanese
Not necessarily; not always; it isn't always the case
そうにない | Unlikely To in Japanese
Unlikely to; shows no sign of; doesn't look like it will
ような気がする | I Have a Feeling in Japanese
I have a feeling that; it seems to me; somehow I think
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