不，他們不是，或者他們沒有，結合上下文的語境，aren't 就是 are not的縮略形式.
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.
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