本来(ほんらい)であればby all rights, legally speaking, properly speaking

本来(ほんらい)であればこの仕事(しごと)はもう終(お)わっているはずだった。

By all rights, this work should have already been finished.

本来(ほんらい)であれば全員(ぜんいん)出(で)席(せき)の会議(かいぎ)が、今回(こんかい)は欠席(けっせき)者(しゃ)が多(おお)いです。

By all rights, everyone should be attending the meeting, but this time there are many absentees.

本来(ほんらい)であれば母(はは)がやる仕事(しごと)を、今日(きょう)は父(ちち)が代(か)わりにしています。

By all rights, it is the work my mother should be doing, but today my father is doing it in her place.

本来(ほんらい)であれば検査(けんさ)を前(まえ)に行(おこな)うのが、緊急(きんきゅう)のためにいきなり手術(しゅじゅつ)をした。

By all rights, a test should have been conducted beforehand, but due to the emergency, surgery was performed suddenly.

本来(ほんらい)であれば新(あたら)学期(がっき)はもう始(はじ)まっているはずが、緊急(きんきゅう)事態(じたい)でまだ始(はじ)まっていない。

By all rights, the new semester should have already started, but due to an emergency, it hasn't started yet.