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QUICK ANSWER
"What is" is a phrase which is often translated as "qué es", and "what are" is a phrase which is often translated as "qué son". Learn more about the difference between "what is" and "what are" below.
what is(
wuht
ihz
)A phrase is a group of words commonly used together (e.g., once upon a time).
what are(
wuht
ar
)A phrase is a group of words commonly used together (e.g., once upon a time).