Eres bonito/a, agradable
The translation for "sweet" in Spanish is "dulce."
So sweet. = Tan dulce.
Dulce
¡Que dulce!
Lovable in spanish is: adorable (ah-do-rah'-blay) or Sweet in spanish is: mimoso
Sweet Lady love = Dulce dama amor
eres dulce
sweet tea
ricura
... or sweet
"You're so sweet, baby!" in English means ¡Eres tan dulce, bebé! in Spanish.
You can say "Primer grado es dulce" in Spanish. This phrase captures the idea that first grade is sweet or enjoyable.