if you're asking for the pronounciation, you read it simply as "ka-pag" using short A sound. No A at the end of the word. "kapag" in english means "when" sorry, but i believe eyhak's sample sentence is gramatically wrong.

you pronounce it exactly as you read it. no silent t's or a's or h's. I think it's a general rule in the Filipino language.

You can use both of /kapag and kapag ka.. example: "KAPAG KA ba nagluto ako kakain ka?" or KAPAG ba nagluto ako kakain ?