Je was op zoek naar: there's another person, isn't there? (Engels - Japans)

there's another person.
他の人がいる

there's another person on earth.
地球上に他の人がいるわ

there's another person on earth!
他の人がいる！

there's another reason, isn't there? well, how did i do? i bet i hit the mark.
別の理由があるね？どう？図星でしょう？

there's another person posing as matthew graham.
今、もう一人あなたが居て そいつがfbiを指揮してる

isn't there another way? he's just a boy!
まだ 子供なのに