YOU SAID:

You've been acting awful lately

INTO JAPANESE

あなたは最近ひどい演技をしています

BACK INTO ENGLISH

You are acting terribly lately

INTO JAPANESE

あなたは最近ひどく行動しています

BACK INTO ENGLISH

You have been acting badly recently

INTO JAPANESE

あなたは最近ひどく行動しています

BACK INTO ENGLISH

You have been acting badly recently