Learn Farsi: هر چه بیشتر تکرار کنی، تلفظ تو روان‌تر می‌شود. - The more you repeat, the more fluent your pronunciation becomes.

It uses har che (literally 'whatever') followed by a comparative word like bishtar (more) in the first clause. The second clause doesn't need a special connecting word; it simply uses another comparative adjective, which is ravān-tar (more fluent) here. Notice that Farsi doesn't use a direct translation of the English word 'the'.

Why is the first verb تکرار کنی (tekrār koni) in the subjunctive mood?

The first half of a 'har che...' sentence acts like a conditional 'if' clause. You are talking about a hypothetical or general action (whenever you repeat more). Because the action is a condition rather than a stated fact, Farsi requires the subjunctive mood.

If تکرار کنی (tekrār koni) is subjunctive, why doesn't it have the be- prefix?

tekrār kardan (to repeat) is a compound verb. With compound verbs using kardan, the subjunctive be- prefix is very often dropped because the non-verbal part (tekrār) already carries the core meaning. You could technically say tekrār bekoni, but tekrār koni is much more natural and common.

Why does the second verb می‌شود (mi-shavad) use the indicative prefix mi- instead of being subjunctive too?

The second clause is the definite result of the first clause. Just like in standard 'if/then' sentences, the condition takes the subjunctive, but the result uses the normal indicative mood because it describes what factually happens as a result.