亲爱的,我一定会珍惜跟你在一起的时光,用英语翻译.

My sweetheart, I will cherish the time we spent together.

“亲爱的”说dear啊honey啊sweetie啊都可以。

alicexingyun的后半句“I will cherish the time we spent together.”比其他人的都要通畅，我推荐使用这个。当然也可以说I will definitely cherish the time I spent with you.

I will value the time together with you.

Honey, I'll cherish the time with you.
I will value the time together with you.
I will value the time together with you.

Dear, I will certainly treasure the time with you.

Honey, I'll cherish the time with you.