YOU SAID:
They're at their party for their friend
INTO JAPANESE
彼らは彼らの友人のために彼らのパーティーにいます
BACK INTO ENGLISH
They are at their party for their friends
INTO JAPANESE
彼らは彼らの友人のために彼らのパーティーにいます
BACK INTO ENGLISH
They are at their party for their friends
You should move to Japan!