如果有一天我不在你身边请好好生活翻译成英文是什么

Please do take good care of yourself,if some day I am not with you.

注:

"some day" 有 "未知" 的含意,这似乎符合了
"有一天" 的原意.

如果 "我不在"是意味着"不存在/死亡",那么这句的英译该为:

Please do take good care of yourself,should one day(或 some day) I am no longer with you.

Someday, if i could not be here with you, please take care yourself.

If I had to be away from you or died one day,you should take care of yourself .

If one day, I am away from you, please take care yourself.