This question calls for a response indicating the extent or degree of some quality. The interrogative pronoun functions almost like an adverb before a modifier, which is always prefixed with KA-.
Pronouns (actor) always come after the question word.
Here are some examples:
|Gaano karami ang dala mong mangga?|
How many mangoes did you bring?
Kaunti lang. (A few.)
|Gaano kadalas ang klase mo sa Tagalog?|
How frequent/often is you Tagalog class?
|Tatlong beses sa isang linggo.|
Three times a week.
|Gaano kalaki ang bahay ni Erap?|
How large is Erap’s house?
|Gaano kahaba ang pila sa sine?|
How long is the line for the movie?
|Hindi masyadong mahaba.|
Not very long.
|Gaano mo ako kamahal?|
How much do you love me?
|Mahal na mahal kita.|
I love you very much.