YOU SAID:

if you got to boarding school

INTO JAPANESE

あなたが寄宿学校に着いたら

BACK INTO ENGLISH

If you arrive at the boarding school

INTO JAPANESE

あなたが寄宿学校に到着したら

BACK INTO ENGLISH

When you arrive at the boarding school

INTO JAPANESE

あなたが寄宿学校に到着したとき

BACK INTO ENGLISH

When you arrive at the boarding school