YOU SAID:

I swear I will call you back, my friend

INTO JAPANESE

私はあなたを私の友人を呼び出して、誓う

BACK INTO ENGLISH

I swear you calling my friend

INTO JAPANESE

私は私の友人を呼び出すことを誓う

BACK INTO ENGLISH

I swear to call my friend

INTO JAPANESE

私は私の友人に電話することを誓う

BACK INTO ENGLISH

I swear to call my friend