"Let's get married someday" 是英文中表示 "改天结婚吧" 的常用说法。

这个表达方式源自于英文中的动词 "get" 和名词 "someday"。"Get" 在这里的意思是 "去做" 或 "成为"，例如 "get married" 就表示 "结婚"。"Someday" 意思是 "某一天"，例如 "I will visit Paris someday" 表示 "我会在某一天去巴黎旅行"。

下面是几个用 "let's get married someday" 表示 "改天结婚吧" 的例句，希望能帮到你：

"I love you so much. Let's get married someday." (我非常爱你。改天结婚吧。)
"We've been together for a long time. Maybe it's time for us to get married someday." (我们在一起已经很久了。也许是我们改天结婚的时候了。)
"I can't wait to spend the rest of my pfe with you. Let's get married someday." (我迫不及待想和你度过余生。改天结婚吧。)