He knows that there is no return in his help to others .
He does not expect others to reciprocate his help . He knows that his help to others will go unreturned . He knows that his help of others will not be returned . He knows that there is no return in his help to others .
He does not expect others to reciprocate his help .
この文の文法上の誤りを修正してください: He knows that there is no return in his help to others . 出力: