"Add" is a transitive verb which is often translated as "sumar", and "express" is an adjective which is often translated as "expreso". Learn more about the difference between "add" and "express" below.
Tiffany was a quiet student, but she expressed herself well when she had to give an oral presentation.Tiffany era una estudiante callada, pero se expresaba bien cuando tenía que hacer una presentación oral.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).