昨天我们很开心用英文怎么说

昨天我们很开心，可以用英语表达为 "We had a great time yesterday."

其中 "had" 是过去式，表示过去发生的事情；"great" 是形容词，意思是很好的、很开心的；"time" 是名词，表示时间、过程等；"yesterday" 是副词，表示在昨天。

例句：

We had a great time at the party yesterday. 我们昨天在聚会上玩得很开心。
Yesterday was a great day, we had a lot of fun. 昨天是个好日子，我们玩得很开心。
We had a wonderful time on our vacation yesterday. 昨天我们度假玩得很开心。