Formal:
* Rwy'n dy garu'n fawr iawn: This is the most literal translation and is appropriate for formal situations.
Informal:
* Dw i'n dy garu di'n fawr iawn: This is a more casual way to say it, but still conveys a strong sense of love.
* Dw i'n dy garu di'n fwy na dim: This means "I love you more than anything" and expresses a very strong love.
* Rwy'n dy garu di'n ddwfn: This translates to "I love you deeply" and emphasizes the depth of your love.
Romantic:
* Dw i'n dy garu di'n anghyffredin: This means "I love you exceptionally" and is a romantic way to say "I love you very much."
* Ti yw fy nghariad: This translates to "You are my love" and is a very intimate and affectionate expression of love.
You can also use different phrases depending on the context. For example, if you are expressing your love for a child, you could say:
* Dw i'n dy garu di'n fawr iawn, fy mhlentyn: This means "I love you very much, my child."
Ultimately, the best way to say "I love you very much" in Welsh is to choose the phrase that feels most natural and meaningful to you.