YOU SAID:

there once was a boring class

INTO JAPANESE

かつて退屈なクラスがあった

BACK INTO ENGLISH

Once there was a boring class

INTO JAPANESE

退屈なクラスがあったら

BACK INTO ENGLISH

If you have a boring class

INTO JAPANESE

退屈なクラスがある場合

BACK INTO ENGLISH

If you have a boring class