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6週5日目 負けるに決まっている
Determination・stance・judgment
6週5日目

〜に決まっている

接続:普通形+に決まっている
certainly by strong conviction
注意 / Note:に決まっている is subjective conviction; に違いない is a strong, well-founded guess; はずだ is a logical expectation or schedule.
比較 / Compare:Same song: 〜に違いない/〜はずだ. These models are often mistakenly chosen for each other — carefully read the 接続 and nuances above and then decide.
よく出る形 / Common form:普通形+に決まっている。Subjective and strongest of the three patterns in the same card — is the speaker's belief, without any basis. Oral language.
そんな話はうそに決まっている。
That was definitely a lie.
今出ても間に合わないに決まっている。
I definitely won't be able to leave now.
この時間に出発したら、渋滞に巻き込まれるに決まっている。
If you leave at this hour, you will definitely get stuck in traffic.

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