Learn Farsi: هر چه که در شرف اتفاق افتادن باشد، مهم است. - Whatever is on the verge of happening is important.

The phrase dar shorof-e means 'on the verge of' or 'about to'. It requires an Ezafe (the invisible linking 'e' sound) connecting it to the following noun or long infinitive. In this sentence, it links to the infinitive ettefâq oftâdan (happening).

Why is the subjunctive verb bâshad used instead of the indicative ast in the first clause?

We use the subjunctive bâshad because har che ke (whatever) introduces an indefinite or hypothetical situation. Since the speaker does not know exactly what the event will be, 'whatever it may be' requires the subjunctive mood in Farsi.

Is the ke in har che ke mandatory for meaning 'whatever'?

No, it is optional. You can simply say har che to mean 'whatever', but adding ke is very common. It acts as a relative pronoun (literally 'whatever that...') and helps the clause flow more naturally into the rest of the sentence.

How is the verb ettefâq oftâdan being used grammatically here?

In Farsi, the full infinitive form ending in -an often functions as a verbal noun, much like English gerunds ending in '-ing'. Here, the compound infinitive ettefâq oftâdan acts as the noun 'happening' so it can follow the prepositional phrase dar shorof-e.