(a male) representing the country of = hameyyatseg et hamedinah shel... (...המייצג את המדינה של)(a female) representing the country of = hameyyatseget et hamedinah shel... (...המייצגת את המדינה של)
(a group) representing the country of = hameyyatsgim et hamedinah shel... (...המייצגים את המדינה של)
(a male) representing the country of Israel = Meyatzeg et Medinat Yisra'el (מייצג את מדינת ישראל)(a female) representing the country of Israel = Meyatzeget et Medinat Yisra'el (מייצגת את מדינת ישראל)
norway
benos tados unido
Representerar landet [Sverige]
Exactly as you have will do fine.
Representando el país de Cuba
holy land = eretz ha-kodesh country of Israel = medinat Yisra'el
Translation: Representamos el país de Colombia.
You say 'Yalda' in Hebrew
to represent = yitseg (יצג). To conjugate "representing" you would have to provide the entire sentence.
Has in Hebrew is: YESH
"Tikra" (תקרה) is how you say ceiling in Hebrew.