Que es eso means 'what is that'.
"Qué es" means "what is". "Quién es" means "who is."
what is this
What month is it (If there is an accenton 'que'; if not:) That it is the month
Que es = What is it?
"What color is this?"
That it is the dolecencia? is that what you mean?
Is mine and that
That is what I wanted.
"¿Qué día es?" means "What day is it?"
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"
"est-ce que tu es triste" means "are you sad?" in French.