我们今天很开心用英文怎么说

"We are having a great time today" 或 "We are having a great day today" 是表达今天很开心的常用说法。其中 "having a great time" 是表达开心的常用短语，"having a great day" 是表达今天很好的常用短语。

例如:

"We are having a great time at the beach today." 今天我们在海滩度过了美好的时光。
"I'm so glad we decided to go on this hike, we are having a great day." 我很高兴我们决定去这次徒步旅行，今天过得很开心。