In Finnish in different situations you use different suffixes. Oletko valmis? = Are you ready? Onko sinulla kylmä? = Are you cold Onko sinulla nälkä? = Are you hungry For example if you want to say "I'm hungry" It's "Minulla on nälkä." Quick summary for you: Oletko = Are you Onko sinulla = do you have (If you have more questions do not hesitate to ask them I would like to help. Also I'm a Finnish language learner)

kiitos Karima, it solved my problem :)

onko sinulla is different then oletko sinä for example 'onko sinulla koulu' means do you have school? and 'oletko sinä oppilas' means are you a student. so basically onko sinulla means do you have and 'oletko sinä' means are you. hopefully this hepls.