when i'm with you,love may come and love may go.when i'm with you,love may come and love may go.but now it's here to stay,forever and a day with you.

问题描述:

when i'm with you,love may come and love may go.
when i'm with you,love may come and love may go.but now it's here to stay,forever and a day with you.

当我跟你在一起的时候,爱情仿佛总是游荡不定,但是现在它停下来了,永远的存留在我们之间,一辈子跟你在一起。

forever and a day 整个是个词组,是“极长久地”的意思.
here to stay 在这里应该有“归属之处”的感觉.
句子翻译起来的话——
“(虽然)和你在一起,爱情似有若无,但现在我只有留在这里,永远地和你在一起.”
大概是这样,因为句子为了追求浪漫,语法上变得不好翻译了,总之是有一种“为了不确定的爱情也要守候着你”的感觉!