YOU SAID:

He learned the important lesson that a picnic at the beach on a windy day is a bad idea.

INTO JAPANESE

彼は風の強い日にビーチでピクニックをするのはまずいという重要な教訓を学んだ。

BACK INTO ENGLISH

He learned the important lesson that it is bad to have a picnic on the beach on a windy day.

INTO JAPANESE

彼は風の強い日にビーチでピクニックをするのは悪いという重要な教訓を学んだ。

BACK INTO ENGLISH

He learned the important lesson that it is bad to have a picnic on the beach on a windy day.