彼(かれ) kareは wa疲(つか)れ()て()い()る() tsukareteiruに ni違(ちが)い()な()い() chigainaiよ yo。 He must be tired. Literal He [topic-は] tired [must be-に違いないよ]. ~に違いない expresses strong inference: 'must be, no doubt.' よ adds assertion. The speaker is confident about their judgment. tiredness~に違いない (must be)sentence-final よ (assertion)
彼(かれ) kareは wa疲(つか)れ()て()い()る() tsukareteiruに ni違(ちが)い()な()い() chigainaiよ yo。 He must be tired. Literal He [topic-は] tired [must be-に違いないよ]. ~に違いない expresses strong inference: 'must be, no doubt.' よ adds assertion. The speaker is confident about their judgment. tiredness~に違いない (must be)sentence-final よ (assertion)