Usages of dēng
我 先 开 灯， 再 看 书。wǒ xiān kāi dēng, zài kàn shū.
I will turn on the light first, then read.
她 关 灯 了， 他 关 门 了。tā guān dēng le, tā guān mén le.
She turned off the light, and he closed the door.
她 把 灯 开 了， 我 就 看 书。tā bǎ dēng kāi le, wǒ jiù kàn shū.
She turned on the light, and then I read.
如果 你 把 灯 关 了， 我 就 不 看 书。rúguǒ nǐ bǎ dēng guān le, wǒ jiù bù kàn shū.
If you turn off the light, I won’t read.
为了 节省 能源， 学校 晚上 十 点 以后 关 掉 很多 灯。wèile jiéshěng néngyuán, xuéxiào wǎnshang shí diǎn yǐhòu guān diào hěnduō dēng.
To save energy, the school turns off many lights after ten o’clock at night.
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