Learn Turkish: Senin dekontu hemen alman için veznedarla konuşacaktım. - I was going to talk to the teller for you to get the bank receipt immediately.

This sentence expresses a past intention (I was going to talk), not an ongoing or continuing action, so the continuous compound verb is not needed. If you wanted to change the context to say, for example, "You keep getting the receipt (while I talk to the teller)," you would attach the suffix to the first verb: Sen dekontu aladur, ben veznedarla konuşayım. The -adur suffix adds the meaning that the action of getting the receipt continues.

Why is the structure Senin ... alman için used to say "for you to get"?

To express "for [someone] to do [something]" in Turkish, you use a verbal noun, give it a possessive suffix, and follow it with the postposition için. Here, the verbal noun is alma (getting) and -n makes it alman (your getting). The genitive pronoun Senin is technically optional but is used here to clearly emphasize who needs to get the receipt.

Why does dekont (receipt) take the accusative suffix -u when it is so far away from the main verb?

dekontu is the specific direct object of the verbal noun alman (getting), not the main verb konuşacaktım (I was going to talk). In Turkish, verbal nouns govern their objects exactly like regular verbs do. Since it refers to a specific bank receipt, it requires the definite accusative suffix.

How do the suffixes on konuşacaktım break down to create the meaning "I was going to talk"?