6週1日目 決めた以上
Determination・stance・judgment
接続：普通形＋以上（は）
Once A, it must be B
注意 / Note：All three mean “once,” often followed by responsibility, determination, or natural conclusion.
比較 / Compare：Same song: 〜上は／〜からには. 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＋以上（は）、〜。The latter is 〜べきだ・〜なければならない・〜つもりだ. The tone is decisive, stating the accompanying responsibilities.
約束した以上、守らなければならない。
Once you make a promise, you must keep it.
参加する以上、最後まで頑張る。
If you participate, try until the end.
引き受けた以上は、途中で投げ出すつもりはない。
Once I received it, I had no intention of giving up halfway.
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