“开心快乐”用英语可以表达为以下几种方式：
- Happy
- Joyful
- Elated
- Overjoyed
- Delighted
- Ecstatic
- Cheered up
- In high spirits
- Radiant with happiness
- Bubbly with joy
根据不同的语境和情感强度，你可以选择最合适的词汇来表达。例如：
- “I’m happy to see you!“（我很高兴见到你！）
- “She was overjoyed to receive the award.“（她因获得奖项而非常高兴。）
- “The news of their wedding made everyone joyful.“（他们结婚的消息让大家都很快乐。）