2021新年快乐用英文表达：Happy New Year 2021。

happy：

adj.感到(或显得)快乐的;高兴的;给予(或带来)快乐的;使人高兴的;幸福的;表示祝愿，如Happy Birthday生日快乐、Happy New Year新年好等；

比较级： happier最高级： happiest

I'm not happy with this way of working.

我不喜欢这种工作方法。

She wasn't happy with our work and made us start over.

她对我们干的活儿不满意，要我们返工。

I said I'd go, just to keep him happy.

我说过我要去只是为了让他高兴。

I'm not happy with his work this term.

我对他这学期的表现不满意。