koks / kokia

Asking what kind. Use koks for masculine nouns and kokia for feminine ones: Koks oras šiandien? (What is the weather like today?) Kokia tavo mėgstama spalva? (What is your favorite color?) Lithuanian often uses koks where English says just "what": Koks tavo vardas? (What is your name?) Kokia šiandien diena? (What day is it today?)

The forms. Koks changes like an adjective:
koks, kokio, kokiam, kokį, kokiu, kokiame · kokia, kokios, kokiai, kokią, kokia, kokioje
Plural: kokie, kokių, kokiems, kokius, kokiais, kokiuose · kokios, kokių, kokioms, kokias, kokiomis, kokiose
For example: Kokiu autobusu važiuoji? (Which bus do you take?) Kokiame mieste gyveni? (What city do you live in?)

Exclamations. Put koks before an adjective and noun to say "What a ...!": Koks gražus vaizdas! (What a beautiful view!) Kokia įdomi knyga! (What an interesting book!)

Color and size. To ask about a property, put koks and the property word in the genitive: Kokios spalvos tavo mašina? (What color is your car?) Kokio dydžio batus nešioji? (What size shoes do you wear?)

Koks or kuris? Koks asks about the kind or quality. Kuris asks you to pick one from a known group: Kuri knyga tavo? (Which book is yours?) Kas is not an agreeing modifier meaning “what kind of”: say Koks filmas?, not Kas filmas?. See kas and ką.