Definite article: Difference between 'ka' and 'kii', 'ta' and 'tii'

There are two types of definite article('the') in Somali.
You use 'ka' or 'ta' if you are introducing something new into the conversation


Isagu waa macallinka cusub - He is the new teacher


You use 'kii' or 'tii' if the topic is already known to the listener


Macallinkii meeyey? - Where is the teacher? (The listener knows that the teacher exists)


Lacagtii meeday ?    - Where is the money? (The listener knows that the money exists)