إِذَا is an adverbial noun. It points to time and also introduces a condition.
It often comes before a verb in the past form, but the sentence can refer to an event in the present or future. So do not translate the Arabic form mechanically as English past tense.
إِذَا حَضَرَ الْمُعَلِّمُ بَدَأَ الدَّرْسُ
When the teacher arrives, the lesson begins.
Both verbs look past in Arabic; the idiomatic meaning describes what happens when the teacher arrives.
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Conditional Sentences with إِذَا and لَوْ
إِذَا is an adverbial noun. It points to time and also introduces a condition.
It often comes before a verb in the past form, but the sentence can refer to an event in the present or future. So do not translate the Arabic form mechanically as English past tense.
إِذَا حَضَرَ الْمُعَلِّمُ بَدَأَ الدَّرْسُ
When the teacher arrives, the lesson begins.
Both verbs look past in Arabic; the idiomatic meaning describes what happens when the teacher arrives.