Learn Turkish: Sette sessiz olmak için telefonları kapatabiliriz. - We can turn off the phones to be quiet on the set.

There actually isn't one! While kapatmak has the causative suffix -t attached to kapamak (to close), it is fully lexicalized as a standard verb meaning 'to turn off' or 'to shut'. We are acting directly on the phones, so telefonları takes the accusative case as a normal direct object. If we were making someone else turn them off, that person (the causee) would take the dative case.

Can you break down the suffixes on kapatabiliriz?

It breaks down as kapat (turn off) + -abil (potential suffix 'can') + -ir (aorist tense) + -iz ('we' personal ending). The aorist tense is commonly used with the potential suffix to make polite suggestions or state general possibilities, which fits perfectly for 'we can turn off'.

Why is it telefonları (accusative) instead of just telefonlar?

We are referring to specific phones—the ones belonging to the people currently on the set. When a direct object is specific, it requires the accusative case marker, which is the -ı at the end of telefonları.

How does için work with verbs like olmak here?