YOU SAID:

they wont join the team anymore?

INTO JAPANESE

彼らはもうチームに参加しませんか？

BACK INTO ENGLISH

Will not they join the team already?

INTO JAPANESE

彼らはもうチームに加わりませんか？

BACK INTO ENGLISH

Will they join the team already?

INTO JAPANESE

彼らはすでにチームに参加しますか？

BACK INTO ENGLISH

Do they already join the team?

INTO JAPANESE

彼らはすでにチームに参加していますか？

BACK INTO ENGLISH

Have they already joined the team?

INTO JAPANESE

彼らはすでにチームに加わっていますか？

BACK INTO ENGLISH

Have they already joined the team?