YOU SAID:
ivan is a party pooper for sure
INTO JAPANESE
イワンは確かにパーティーの座り屋です
BACK INTO ENGLISH
Ivan is certainly a party siter
INTO JAPANESE
イヴァンは確かにパーティーのサイトャーです
BACK INTO ENGLISH
Ivan is certainly a party siter
You've done this before, haven't you.