あんなに高そうな指輪をもらったんだから、彼女は喜ぶ「に決まっている」よ。
The grammar pattern "~に決まっている" (ni kimatte iru) expresses a very strong conviction or certainty about something. It means "it's absolutely certain that," "it must be," or "there's no doubt that." It indicates the speaker's firm belief based on some evidence or logic, implying that the conclusion is obvious.
根拠に基づいて、間違いなくそうだろうと確信している時に使います。客観的な状況や事実から考えて、当然そうなるという強い断定を表します。
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