Do you use "ako" or "ko" with verbs and adjectives?

Question

Answer

"Ako" is used as a SUBJECT / OBJECT
"Ko" is used as POSSESSIVE PRONOUN

Example:
Ako ay matangkad. (I am tall.)
Ako ay naglalakad. (I am walking.)
Tinawag mo ako. (You called me.)

Ito ang pagkain ko. (This is my food.)

"Ko" an also be used as a contracted form of "Ako" (as OBJECT)

Example:
Tinawag mo ko. (You called me.)

Answer

Depending on how you wanna construct your sentence.

Ex. Adjective 
Ang taba ko. 
and
Mataba ako.

Both mean I am fat.

Ex. Verb
Nakain ako.

Answer

Ako is always used for adjectives.