次第だ・次第で

次第だ and 次第で express that the outcome, decision, or situation hinges on a preceding factor or condition. The speaker emphasizes that the result is not fixed and will change depending on the mentioned element (e.g., preparation, weather, effort). It is common to state a simple fact with 次第だ, or to link a condition with 次第で to describe how the result changes under that condition. Use with nouns (like 状況, 天気, 準備) or with a noun referring to a factor; the second form often precedes a verb to show the resulting action depends on that factor.