1. –Kah makes a phrase a question.
2. –kah is attached to the focus of question:
2a. Focus on Identity in the query
Diakah abang awak? (is he your brother?)
2b Focus on ownership in the query
Dia abang awakkah? (Is he your brother?)
2c. focus on name
Siapakah nama awak ? (What is your name?)
2d. Confirm the name
Nama awak Ramlikah? (is your name Ramli?)
2e Focus on price
Berapakah harga barang ini? (How much is this thing?)
2f Confirming the price
Harga barang ini sepuluh dolarkah? (Is this thing ten dolar?)
Notice that the –kah attaches to dolar instead of ten because the price comes in dolar i.e. ten dolar not just ten.