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QUICK ANSWER
"I was" is a form of "I was", a phrase which is often translated as "fui". "As a child" is a phrase which is often translated as "de niño". Learn more about the difference between "as a child" and "I was" below.
as a child()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
b. cuando era niño
There are a lot of foods that I eat now that I didn't like as a child.Hay muchas comidas que como ahora que no me gustaban cuando era niño.
I was()
A phrase is a group of words commonly used together (e.g., once upon a time).
a. fui
I was the first person to be chosen for the team.Fui la primera persona elegida para el equipo.