YOU SAID:

Hi guys join my party

INTO JAPANESE

こんにちは、あなたたちは私のパーティーに参加します

BACK INTO ENGLISH

Hi, you guys are going to my party

INTO JAPANESE

こんにちは、あなたたちは私のパーティーに行くつもりです

BACK INTO ENGLISH

Hi, you guys are going to my party