باید از عادت‌های مضر پرهیز کنی تا بهبود یابی.

From Lesson 193:Reported commands·Farsi

Questions & Answers about باید از عادت‌های مضر پرهیز کنی تا بهبود یابی.

Why doesn't the verb پرهیز کنی (you avoid) start with the subjunctive بـ (be-) prefix?
پرهیز کردن is a compound verb. In Farsi, when forming the present subjunctive of compound verbs (especially those ending in کردن), the بـ prefix is frequently dropped. You just use the present stem of the helper verb plus the personal ending, giving us کنی.
Why do we use the preposition از (from) before عادت‌های مضر (harmful habits)?
In English we just "avoid something," but in Farsi, the verb پرهیز کردن (to avoid/abstain) always requires the preposition از. Think of it literally as "abstaining from something."
Why is the second verb, بهبود یابی, also in the subjunctive mood?
The conjunction تا is used here to mean "in order to" or "so that." Whenever تا introduces a purpose or an intended outcome, the verb following it must be in the present subjunctive. Just like the reported commands in this lesson, you are talking about an action that hasn't happened yet but is desired.
What is the base form of بهبود یابی (you recover)?
The infinitive is بهبود یافتن (to improve / to recover). The helper verb here is یافتن (to find/obtain) instead of the more common کردن or شدن. Its present stem is یاب (yâb), and with the "you" ending it becomes یابی (yâbi). Note that it also drops the بـ prefix in the subjunctive, just like the first verb in this sentence!

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