When an adjective modifies a noun, the linker nga links the two.
Itom nga ido
Sometimes, if the linker is preceded by a word that ends in a vowel, glottal stop or the letter N, it becomes acceptable to contract it into -ng, as in Filipino. This is often used to make the words sound more poetic or to reduce the number of syllables. Sometimes the meaning may change as in maayo nga aga and maayong aga. The first meaning: (the) good morning; while the other is the greeting for 'good morning'.
The linker ka is used if a number modifies a noun.
Anum ka ido