serious：
單詞釋義：不好的；嚴重的；有危險的；需認真思考的；嚴肅的；重要的；須重視的
對某人嚴肅
Be serious to sb
對某事是認真
Be serious about sth
對什麽是認真
What is serious about
對什麽很認真
What are you serious about
珍妮做作業和他姐姐壹樣認真
Jenny does her homework as carefully as her sister
對什麽什麽是認真
What is serious about
我要上課認真聽講
I want to listen carefully in class