vi.1.lights +亮；electricity +开启；central heating +开始工作
Suddenly, all the lights came on again.突然, 所有的灯又都亮了。
2.(make progress)pupil +取得进步；work, project +取得进展；injury +好转；恢复；改善
3.(start to happen)season +到来；illness +开始
Winter is coming on again.冬天又来了。
I feel a cold coming on.我觉得我要感冒了。
4.broadcast +广播；播出
When the show came on we had to be quiet.演出时我们都得保持安静。
5.【体】(体育比赛中)上场(替换下某人)
He came on as a substitute at half-time.他在半场时作为替补上场。
6.(start to fall)rain, snow +开始下