Hi, I see something wrong in the translation.
I think it should be "the boys were back".
'The boys are back' is another way of saying 'The boys have returned' , which is a passé composé. Les garçons sont revenus is passé composé. 'The boys were back' seems like le plus-que-parfait (pluperfect) tense: Les garçons étaient revenus..
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