What is good morning to all of you in gaddang dialect?

There's no single, definitive "good morning" in Gaddang dialect. It depends on the specific sub-dialect and context. Here are a few possibilities, with varying levels of formality:

Informal:

* Magayad ka? (How are you?)

* Naimbag ka? (Are you well?)

* Arayat ka? (Are you good?)

* Makasiat ka? (Are you happy?)

Formal:

* Mannayon ka? (How are you?)

* Napno ka? (Are you good?)

In most cases, a simple "Magayad ka?" would be suitable as a general greeting.

It's worth noting that Gaddang is a spoken language with limited written resources, so the exact pronunciation and usage might vary depending on the speaker.