Question 1

Why does همین که (as soon as) take the simple past (منفجر شد) here instead of the subjunctive?

Accepted Answer

When همین که describes a completed event that already happened, you use the indicative mood—in this case, the simple past (شد). If the sentence were talking about a future or hypothetical event ("As soon as the gas explodes..."), you would use the subjunctive mood instead.

Question 2

The word آزمایشگاه means "laboratory". What does the گاه part mean at the end?

Accepted Answer

The suffix گاه (gāh) means "place of". It is added to nouns to show where a specific activity happens. Here, it is added to آزمایش (experiment or test), creating "the place of experiments"—a laboratory! You might remember it from earlier words like دانشگاه (university, "place of knowledge").

Question 3

Why do we need the word را after آزمایشگاه?

Accepted Answer

The word را is a marker that points to the specific direct object in a sentence. Since "the laboratory" is a specific, known place that is receiving the action of the verb "left", it requires را right after it.

Question 4

"We left" is translated as ترک کردیم. How does this verb work?

Accepted Answer

This is a compound verb, which is a very common way Farsi creates verbs. It combines the noun ترک (leaving or abandoning) with the helper verb کردن (to do). To say "we left", you simply conjugate the helper verb in the simple past for "we", which gives you کردیم.

همین که گاز منفجر شد، آزمایشگاه را ترک کردیم.

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