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"It's" is a form of "it's", a contraction which is often translated as "es". "I'm" is a contraction which is often translated as "soy". Learn more about the difference between "it's" and "I'm" below.
it's(
ihts
)A contraction is a shortened form of a word or group of words made by omitting a sound or letter (e.g., don't).
I'm(
aym
)A contraction is a shortened form of a word or group of words made by omitting a sound or letter (e.g., don't).