型が決まっているって英語でなんて言うの？

Question : Which do you find easier, the English that's used in business emails or the English that's used with (close) friends? Answer: I find the English that's used in business emails easier, because business emails are very formulaic / because there are set rules you have to follow when writing business emails / because there's a set format for business emails. Formulaic - 定式の、規定どおりの、紋切り型の because there are set rules you have to follow when writing business emails - ビジネスメールを書く時に従わなければならないルールがあるから because there's a set format for business emails - ビジネスメールのフォーマットが決まっているから 設問ですが、Do you find the English that's used in business emails easier or do you find the English that's used between (close) friends easier ? も大丈夫です。