多くの人は日曜日が休みって英語でなんて言うの？

• "Most people have Sundays off."　
  "most people" 「多くの人」
  "have Sundays off" 「日曜日が休み」

• "Most people don't work on Sunday."
  "don't work on Sunday" 「日曜日は仕事をしません」

• "Most people have the day off on Sunday."
  "have the day off on Sunday." 「日曜日が休み」

"Most people" の代わりに "A lot of people" も使えます。
"A lot of people have Sundays off."