Happy New Year!" Happy New Year" is the correct way. (正解!) "Years" is the plural form of "year" as in "many years". If you have heard "Happy New Years", it's either a misspelling or it could be interpreted as "year's" as in "Happy New Year's (Day) or Happy New Year's (Eve).|Happy new year is correct. We do not say Happy New Years!的同义词
What is the difference between Happy sweet 18 and Happy 18th birthday ?Feel free to just provide example sentences.