不，他们不是，或者他们没有，结合上下文的语境，aren't 就是 are not的缩略形式.
如:
They aren't strict with me.
They aren't friendly to me.
They aren't good at drawing.
They aren't going to go to cinema after school.
They aren't at school.
They aren't my parents.
-Are those dictionaries Lucy's?
-No， they aren't. Hers are in her
schoolbag.
-Ar the kids playing in the park?
-No， they aren't.
