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Both "nacieran" and "nacían" are forms of "nacer", which is often translated as "to be born". Learn more about "nacer" below.
nacer(
nah
-
sehr
)An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
2. (to develop)
4. (to arise)
a. to grow
De ese encuentro, nació una bonita amistad.From that meeting, a beautiful friendship grew.
5. (astronomy)