YOU SAID:

I really appreciate that you came to this great party with the aliens

INTO JAPANESE

私は本当にあなたがこの偉大なパーティーに来たことに感謝します。

BACK INTO ENGLISH

I am truly grateful that you came to this great party.

INTO JAPANESE

あなたがこの素晴らしいパーティーに来たことに本当に感謝しています。

BACK INTO ENGLISH

I am truly grateful that you came to this wonderful party.

INTO JAPANESE

あなたがこの素晴らしいパーティーに来たことに本当に感謝しています。

BACK INTO ENGLISH

I am truly grateful that you came to this wonderful party.