Overview
This cluster is best organized as a confidence scale. At the top sits に違いない, a near-certain inference — “it must be.” In the likely-to-agreed middle are じゃない (inviting agreement, “~ right?”) and 確かに (granting a point, “true, admittedly”). Lower down is もしかしたら, a tentative “maybe, perhaps.” At the bottom, marking unlikelihood, are そうもない (“very unlikely, no sign of it”) and まさか (“surely not — no way”). Several of these are adverbs that set up a matching sentence-ending — もしかしたら wants かもしれない, まさか wants a surprised とは — so students should learn each as a frame, not a floating word. The entries below place each on the scale, with the humor running through varied mechanisms.
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