Formal:
* Aroha ahau ki a koe. (This is the most literal and formal translation)
Informal:
* Aroha ahau ki a koe. (This is also used informally)
* Kei te aroha ahau ki a koe. (This is a more emphatic way to say "I love you")
* E aroha ana ahau ki a koe. (This is a more poetic way to say "I love you")
* Aroha koe. (This is a shortened version of "Aroha ahau ki a koe," which can be used with loved ones)
Other options:
* Kei te hiahia ahau ki a koe. (This translates to "I want you," but is often used as a way to express love)
* He nui taku aroha ki a koe. (This translates to "I love you very much")
It's important to note that the best way to say "I love you" in Māori depends on the relationship you have with the person you are speaking to. It is always best to err on the side of caution and use a more formal phrase if you are unsure.