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QUICK ANSWER
"They are" is a form of "they are", a phrase which is often translated as "ellos son". "He is" is a form of "he is", a phrase which is often translated as "es". Learn more about the difference between "they are" and "he is" below.
they are()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
he is()
A phrase is a group of words commonly used together (e.g., once upon a time).