Cuan dulce is "How sweet"
and Muy dulce is "Very sweet".
muy dulce
Muy / bastante dulce / meloso, a
Eso es muy dulce.
"Ese mensaje fue muy dulce"
If you mean "sweet" as in a flavor, "eso es dulce" or perhaps "Que dulce". If you mean something that is caring or emotional, perhaps "Eso es precioso/a", "que amable", "es mono/a", "es suave", or "es rico/a"
To Spanish: muy hermosa It is written in English Above...
hola tu estas muy bonita y hermosa
"Tú eres dulce pa' dicerme esto" means "You are sweet for telling me this" however it is misspelled and uses improper phrasing. "Tu eres dulce por decirme esto" is a better, though still awkward way to say this sentence. Pa' is a contraction of the Spanish word "para" which in this context means "for". However the Spanish word "por" (by) can also translate to English as "for" and in this case would be the preferred word.
Usted es un niño dulce/tierno. (formal 'you') Tú eres un niño dulce/tierno. (informal 'you')
My very fat cat.
Take care. You are very pretty.
Depends on how you mean "very nice" Muy simpatico/a ([a person only] is very nice) Muy agradable (very agreeable) (person or thing or concept) Muy bueno/a (very good) Muy bien ([something is] very well [done]) Muy bonito/a (very pretty)