How to Say "to combine" in Spanish
The Spanish word for “to combine” is “unir” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
VerbA1
mixing ingredients or elements

Examples
Tienes que unir las dos piezas con pegamento.
You have to join the two pieces with glue.
El director quiere unir los esfuerzos de ambos equipos.
The director wants to unite the efforts of both teams.
La costurera unió la tela con hilo rojo.
The seamstress joined the fabric with red thread.
Regular -IR Verb
Unir is a regular verb, meaning its endings follow the standard pattern for verbs ending in -ir, making it easy to conjugate.
Mixing up 'unir' and 'estar unido'
Mistake: “Los cables son unidos. (The cables are joined.)”
Correction: Los cables están unidos. (The cables are joined.) 'Unir' is the action, 'estar unido' is the resulting state.
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