Breakdown of اگر کارتن سنگین باشد، باید دو تمبر بخرید.
بودنbudan
to be
سنگینsangin
heavy
دوdo
two
خریدنkharidan
to buy
بایدbâyad
must
کارتنkârton
box / carton (cardboard)
اگرagar
if
تمبرtambr
stamp (postage)
Questions & Answers about اگر کارتن سنگین باشد، باید دو تمبر بخرید.
Why does the first part of the sentence use bāshad instead of the regular word for 'is', ast?
This sentence is a first conditional, which talks about a real possibility ('if the carton is heavy'). In Farsi, the word agar (if) must be followed by a verb in the present subjunctive. bāshad is the present subjunctive form of the verb 'to be'.
The lesson says the second part of a first conditional usually takes a normal present or future tense. Why does bekharid use the subjunctive?
You are right that the result clause usually uses the normal present or future tense. However, this specific sentence uses the word bāyad (must). In Farsi, bāyad always forces the main verb that comes after it into the subjunctive mood, which overrides the conditional rule. That is why we use bekharid instead of mikharid.
Does the word bāyad change depending on who has to buy the stamps?
No, bāyad is a frozen word that never changes to match the person doing the action. We know the sentence means 'you must buy' because the second verb, bekharid, ends in -id, which is the 'you' (formal or plural) ending.
Since the sentence says 'two stamps', why is tambr in the singular form?
In Farsi grammar, whenever a noun comes directly after a number, it stays in its singular form. This rule is very strictly followed, so saying 'two stamps' translates literally to 'two stamp' (do tambr).
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