And you don`t know if it will be your lest.And you don`t know if itwill be your lest.

And you don`t know if it will be your lest.And you don`t know if itwill be your lest.
And you don`t know if it will be your lest.
And you don`t know if it
will be your lest.

And you don`t know if it will be your lest.And you don`t know if itwill be your lest.
lest是个连接词,不是名词,所以,不能接在名词所有格后面,如果非要翻译的话,那就是“你不知道它是否会成为你的负担”.

lest 唯恐 担心
如果你不知道的话，你将会担心