YOU SAID:

its difficult to learn how to play trombone

INTO JAPANESE

トロンボーンを演奏する方法を学習することは困難

BACK INTO ENGLISH

Difficult to learn how to play the trombone

INTO JAPANESE

トロンボーンを演奏する方法を学ぶことは困難

BACK INTO ENGLISH

Difficult to learn how to play the trombone