When I got home, my mom was cooking dinner.
當我到家時，我媽媽正在煮晚餐。
I always listen to music when I take the MRT.
當我搭捷運時，我總是聽音樂。
When the bell rang, all the students went back to their seats.
當鐘聲響起時，所有的學生都回到座位上。
Please call me when you arrive at the train station.
當你抵達火車站時，請打電話給我。