Learn Turkish: Başkan, topluma refah ve kalkınma vaatlerini sundu. - The president presented the pledges of prosperity and development to the society.

You can replace the word ve (and) to emphasize that the pledges included both things. The sentence becomes: Başkan, topluma gerek refah gerekse kalkınma vaatlerini sundu. (The president presented the pledges of both prosperity and development to the society.)

Let's break down the suffixes on vaatlerini. Why does it end in -ni?

vaat means pledge or promise. We add -ler (plural) and -i (possessive compound marker, linking it to the prosperity and development). The final -i is the definite accusative case marker because these specific pledges are the direct object of the verb sundu (presented). The -n- in between is a buffer letter.

If the root is vaat, why doesn't the 't' change to 'd' (consonant mutation)?

Consonant mutation usually happens when a suffix starting with a vowel is added directly to the root (for example, the singular 'his pledge' would mutate to become vaadini). Here, the first suffix we add is the plural -ler, which starts with a consonant. Once -ler is attached, the 't' in the root is shielded from the following vowels.

Why does toplum (society) take the -a ending here?