評論
打印
重點講解：
1. be on
（機器、電燈等）開著，工作著，使用中
eg. The light was on and the door was open.
燈亮著，門也敞開著。
eg. The television set was on.
電視機開著。
2. It's time to do sth.
是時候做某事；
eg. It's time to start swotting up for the exam.
現在該開始好好復習準備考試了。
eg. I think it's time to wind up this meeting.
我認為現在該結束這個會議了。
