"We are strangers to this land and do not know all the customs."

Or anyway, you know all the present customs and regulations.

Still, the first step in understanding someone is to know their customs.

Arriving in a foreign land, not knowing the language or the customs, has never been easy for new immigrants.

You must also know the customs of the game and how to finnesse the rules.

From this spot we invite you to know our customs and traditions.

Why did the Skidians just assume he knew their customs?

I tell Huon that you're not supposed to know our customs but- well, he didn't like it.

"I'm amazed that you don't even know your own customs."

At least she knows the customs of the Hellers, and can persuade him to follow them.