电灯坏了，请去买一个新的。
diàndēng huài le ， qǐngqù mǎi yígè xīnde 。
The electric light is broken, please go buy a new one.
晚上开电灯，房间里亮了很多。
wǎnshàng kāi diàndēng ， fángjiān lǐ liàngle hěnduō 。
The electric light was turned on at night, the room became very bright.
他换了一个更亮的电灯。
tā huànle yígè gēng liàng de diàndēng 。
He replaced it with a brighter electric light.