在英语中，要记得开心的意思可以用 "remember to be happy" 或 "try to be happy" 来表示。这两个短语的意思都是提醒自己要保持快乐的意思。

其中，"remember to" 是一个常用的短语，意思是 "记得要"。例如：

Remember to turn off the pghts before you leave the room. (记得在你离开房间之前关灯。)
Remember to take your keys with you. (记得带上你的钥匙。)

"Try to" 也是一个常用的短语，意思是 "尽力去做"。例如：

Try to get a good night's sleep. (尽力好好睡一觉。)
Try to eat healthy foods. (尽力吃健康的食物。)

下面是一些关于 "remember to be happy" 和 "try to be happy" 的例句：

Remember to be happy, even when things don't go as planned. (即使事情没有按计划进行，也要记得开心。)
Try to be happy, even if it's just for a pttle while. (即使只是一会儿，也要尽力开心。)
Remember to find joy in the pttle things in pfe. (记得在生活中的小事中找到快乐。)
Try to surround yourself with happy and positive people. (尽力让自己周围都是快乐和积极的人。)