the boy is so young that he cant carry the heavy boxthe boy is not -------- --------- to carry the heavy box

the boy is so young that he cant carry the heavy boxthe boy is not -------- --------- to carry the heavy box
the boy is so young that he cant carry the heavy box
the boy is not -------- --------- to carry the heavy box

the boy is so young that he cant carry the heavy boxthe boy is not -------- --------- to carry the heavy box
the boy is not (old enough ) to carry the heavy box

old enough

the boy is not (old enough) to carry the heavy box
old enough
年纪足够大