YOU SAID:

They went to the party, and they did not enjoy themselves very much.

INTO JAPANESE

彼らはパーティーに行きましたが、あまり楽しめませんでした。

BACK INTO ENGLISH

They went to a party, but they didn't have much fun.

INTO JAPANESE

彼らはパーティーに行きましたが、あまり楽しくありませんでした。

BACK INTO ENGLISH

They went to a party, but it wasn't very fun.

INTO JAPANESE

彼らはパーティーに行きましたが、あまり楽しくありませんでした。

BACK INTO ENGLISH

They went to a party, but it wasn't very fun.