Quick answer
"Dos" is an adjective which is often translated as "two", and "tres cosas" is a phrase which is often translated as "three things". Learn more about the difference between "dos" and "tres cosas" below.
An adjective is a word that describes a noun (e.g. the big dog).
1. (number)
a. two
Tenemos dos hijos.We have two children.
A masculine noun is used with masculine articles and adjectives (e.g. el hombre guapo, el sol amarillo).
2. (number)
a. two
El dos es mi número de la suerte.Two is my lucky number.
b. second (in dates)
Loli cumple años el dos de agosto.Loli's birthday is on the second of August.
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tres cosas
A phrase is a group of words commonly used together (e.g once upon a time).
1. (three objects)
a. three things
Sé que tenía que comprar tres cosas en el supermercado, pero solo recuerdo dos.I know I had to buy three things at the supermarket but I can only recall two.
2. (three actions or concerns)
a. three things
Hay tres cosas que tengo que hacer mañana sin falta antes de ir al aeropuerto.There are three things I have to do tomorrow without fail before going to the airport.
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