Formal causal conjunction (zirâ)

Formal Reasons: "Because" and "For"

When expressing reasons in formal, academic, or logical contexts, use the conjunction زیرا (because / for).

Grammatically, زیرا connects two independent clauses. The clause following it remains in the standard indicative mood (such as the simple present or past tense) to present a concrete fact or logical premise.

You will often see زیرا paired with formal compound verbs—like citing, inferring, or refuting—to explain the reasoning behind a conclusion.

Whether the main statement is active or passive, زیرا smoothly connects a phenomenon to its supporting evidence.

Backing Up Arguments

Because the clause following زیرا is independent, you can justify an argument by citing ongoing truths or past discoveries. Just ensure the verb remains in the indicative mood.