Possible Results:
estabas sustituyendo
-you were substituting
Imperfect progressivetúconjugation ofsustituir.
estabas sustituyendo
-you were substituting
Imperfect progressivevosconjugation ofsustituir.

sustituir

TRANSITIVE VERB
(to exchange)-to substitute
Synonyms for sustituir
reemplazar
to replace
relevar
to relieve
suplantar
to stand in for
suplir
to replace
canjear
to exchange
sustituir a
to replace
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