ことにするとMeanings1expressionperhaps; maybe; possiblyusually written using kana aloneExpresses conjecture or possibility. Often used at the beginning of a sentence or clause to soften a statement.ことにすると、彼かれはもう来こないかもしれない。Perhaps he won't come anymore.ことにすると、それは本ほん当とうではないと思おもう。Maybe I think that's not true.