Past obligation (كان يجب أن)

Past Obligation: "Should have"

To express hindsight or say that something "should have" been done in the past, use the fixed phrase كان يجب أن followed by a present tense verb.

Unlike other structures using كان, the phrase كان يجب أن remains entirely fixed. It does not conjugate to match the subject. Only the present tense verb that follows أن changes to match who was supposed to do the action.

The Subjunctive Mood

Because the main verb follows the particle أن (that), it must be placed in the subjunctive mood. For most singular subjects, this simply changes the final short vowel to a fatha (though it is often unwritten in daily use).

However, for verb forms that usually end in ون or ين (such as the plural "you" or "they"), the subjunctive mood requires dropping the final ن and adding a silent alif at the end of plural masculine verbs.

Asking Questions in Hindsight

To ask if something should have been done, simply place a question word like هل directly before the fixed phrase.

Seeing the endings

This course writes Arabic the way books and newspapers print it, without the short-vowel marks, so the ending this lesson is about is something you hear in the audio but never see in the drills. Here are some of them with every vowel written out:

presentafter كان يجب أن
نُرَاجِعُكَانَ يَجِبُ أَنْ نُرَاجِعَ مُسَوَّدَةَ العَقْدِ
يَرْفُضُكَانَ يَجِبُ أَنْ يَرْفُضَ المُدِيرُ هَذِهِ الصَّفْقَةَ
تُرَاجِعُونَكَانَ يَجِبُ أَنْ تُرَاجِعُوا هَذِهِ المُسَوَّدَةَ

After أن the verb is in the subjunctive. The final -u becomes -a, which you only hear. The plural change you can see: the ن of تراجعون drops, and تراجعوا is written with a silent alif.

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