Learn Farsi: بیایید کار کنیم تا مرسوله زود فرستاده شود. - Let's work so that the package is sent early.

When suggesting "let's do something", Farsi pairs the imperative of "to come" with the "we" form of the main verb. You choose between biyâ (addressing one person informally) and biyâ'id (addressing multiple people or someone formally). Here, the speaker is addressing a group or speaking formally, so they use biyâ'id.

Why is the main verb kâr konim in the subjunctive?

The "Let's" structure requires the main verb to be in the present subjunctive. The word biyâ'id sets up the proposal, and kâr konim (from kâr kardan) takes the subjunctive form because it's a suggested, desired action rather than a statement of fact.

How do we know tâ means "so that" instead of "until" in this sentence?

tâ can mean "until", but when it connects an action (kâr konim) to its intended goal or purpose, it translates to "so that" or "in order to". Whenever tâ means "so that", it requires the verb in the following clause to be in the subjunctive, just like we see here.

How is the passive voice built in the phrase ferestâde shavad (is sent)?