prep.介系詞關於;有關John wrote a book on rock music
prep.介系詞(發生)在...時候We will eat together on Tuesday
adv.副詞開著;正在運行The radio is on, come listen to the program
prep.介系詞(覆蓋、附著)在...之上Put your book on the table and your shoes on the floor
adj.形容詞在(某節日)The lunch meeting is on Tuesday
adv.副詞向前;前進地Come on out we’re going to the shops, do you want to come?
prep.介系詞在...(日期)I will see you on Monday.
adj.形容詞開啟的The television is on.
prep.介系詞依靠He is living on social security.
prep.介系詞由...負責The responsibility is on you.
prep.介系詞服用(藥物)She is on medication for her anxiety.
prep.介系詞穿著He had a coat on.
prep.介系詞在...上I saw it on the news.
prep.介系詞在...中She is on a diet.
prep.介系詞對There was an attack on the embassy.