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"It is" is a phrase which is often translated as "es", and "it's" is a contraction which is also often translated as "es". Learn more about the difference between "it is" and "it's" below.
it is(
iht
ihz
)A phrase is a group of words commonly used together (e.g., once upon a time).
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).