Formal:
* Anh yêu em (for a man to a woman)
* Em yêu anh (for a woman to a man)
* Em yêu chị (for a woman to an older woman)
* Anh yêu chị (for a man to an older woman)
Informal:
* Mình yêu bạn (literally "I love you" - can be used between any genders)
* Tôi yêu bạn (also literally "I love you" - more formal than "mình yêu bạn")
Romantic:
* Em yêu anh/chị rất nhiều (I love you very much)
* Anh/chị là cả thế giới của em (You are my whole world)
Note:
* The formal forms use "anh" for a man, "em" for a younger person, and "chị" for an older woman.
* The informal forms are more neutral and can be used between friends, family, or romantic partners.
* "Rất nhiều" means "very much."
* "Cả thế giới của em" literally translates to "the whole world of me" and implies a deep and passionate love.
It's important to choose the appropriate phrase depending on the situation and your relationship with the person you're speaking to.