Formal:
* Rwy'n dy garu di: This is the most literal and formal translation, meaning "I love you."
* Rwy'n caru di: This is a more casual and slightly less formal version of the above.
Informal:
* Dw i'n dy garu di: This is a more familiar and informal version of "I love you."
* Dw i'n caru di: This is even more informal and casual than the previous version.
Romantic:
* Cariad: This is a word for "love" that is often used in a romantic context, similar to "darling" in English. You might say "Cariad" or "Cariad bach" (little love) as a term of endearment.
Other expressions:
* Rwy'n dy hoffi di: This means "I like you" and is often used for platonic love, such as between friends or family.
* Rwy'n dy garu'n fawr: This translates to "I love you very much" and is a more emphatic way to say "I love you."
Ultimately, the best way to say "I love you" in Welsh will depend on your relationship with the person and the context of the situation.