تو نمی‌توانستی دلایل این قوانین را توضیح بدهی.

From Lesson 233:Arabic broken plurals·Farsi

Questions & Answers about تو نمی‌توانستی دلایل این قوانین را توضیح بدهی.

I see dalâyel means reasons, but what is its singular form?
The singular form is dalil (reason). dalâyel is an Arabic broken plural, which means instead of adding a regular Persian suffix like -hâ, the word's internal structure changes. This is a very common plural form to learn.
Is qavânin also one of these Arabic broken plurals?
Exactly! It is the broken plural of qânun (law). While you might hear qânun-hâ in casual speech, qavânin is the standard plural you will encounter in most writing and speech.
Why is the first verb nemi-tavânesti (past continuous) instead of a simple past tense?
In Farsi, the verb tavânestan (to be able to) is usually conjugated in the continuous form (with the mi- or negative nemi- prefix) to express a general past ability, translating to 'could' or 'was able to'.
Why does the sentence use the subjunctive touzih bedehi at the end if the sentence is in the past tense?
The verb tavânestan (to be able to) always triggers the subjunctive mood for the action verb that follows it. Even though the first verb is in the past tense, the second verb (touzih dâdan) must still take the present subjunctive form (touzih bedehi).
Why is the object marker placed after qavânin and not right after dalâyel?
The marker must always go at the very end of the entire direct object phrase. The object here isn't just the single word 'reasons', but the whole linked phrase 'the reasons for these laws' (dalâyel-e in qavânin).

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