"Bíonn siad ag rith ar an trá."

Translation: They do be running on the beach.

[Ranazu108]

What would be another way to say this in English besides "They do be..." or just "They are..."?

[scilling]

“They are habitually/customarily/usually/regularly/always/forever/etc. running on the beach” — just add a suitable adverb.

[Spirity1]

The sentence sounds so weired.

[NadavVinik]

https://www.google.co.il/amp/s/stancarey.wordpress.com/2015/03/13/do-be-doing-bes-habitual-aspect-in-irish-english/amp/

[joesimpson]

They do be running?

[NJI741534]

They run on the beach accepted as correct! Yay!

[EdelNiGearailt]

"Do be" =

[Samthedog2]

As an example of Hiberno-English, the present-habitual construction "do be" continues to be used in some parts of Cork city, such as the Northside -"he do be working down town" or "he do have a new car." For that matter, Joyce uses it in "Ulysses": "Who is the gentleman does be visiting them".
-Corcaigh Abu!

[SatharnPHL]

It's hardly limited to Cork city, the construction is still part of the vernacular throughout the country.

Further up the street, florist Dee Curry was parked in a loading bay making one of her many deliveries around the city: “Most of the time, I do be dreading trying to get parking,” she said.

That's a quote from someone in Dublin, included in an article in the Irish Times last year. It's unusual enough to see it in print, but it is still very much a normal part of the spoken language.