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Combinar vs. mezclar vs. unir

Although combinar, mezclar, and unir may be translated as to combine in English, they are used in different contexts in Spanish, each with unique nuances.

Combinar

A2
This word generally implies bringing together different elements to achieve harmony or functionality. The emphasis is on accomplishing an aesthetic or strategic combination.
Voy a combinar esta falda con una blusa blanca.
(I'm going to combine this skirt with a white blouse.)
Podemos combinar nuestros recursos para terminar el proyecto.
(We can combine our resources to finish the project.)

Mezclar

A2
Mezclar refers to the mixing or blending of multiple elements into one, often resulting in something new or different.
Mezcla la harina y el agua para hacer la masa.
(Mix the flour and water to make dough.)
No me gusta mezclar los negocios con el placer.
(I don't like mixing business with pleasure.)

Unir

B1
Unir literally means to join. It involves bringing together two or more entities to form a singular unit or bond.
Vamos a unir las dos mesas para la fiesta.
(Let's join the two tables for the party.)
El amor une a las personas.
(Love unites people.)

Summary

In conclusion, while combinar, mezclar, and unir all imply some form of bringing together, their usage significantly differs. Combinar typically involves assembling elements harmoniously, mezclar involves blending elements into something different, and unir implies joining together into a singular unit.