..doesn't work.
...isn't working.
...didn't work.（指过去）
（什么东西）坏了，不能用了，无法使用。
1.The heater isn’t working. Why don’t we use the air conditioner?
暖气坏了，我们为啥不用空调呢？
2.The key doesn’t work. I have to wait until my roommate comes home.
钥匙开不了门，我只要等室友回家。
3.One of the lights isn’t working. Can you have a look at it?
有个灯不亮了，你能帮我看一下吗？
注： It doesn't work/isn't working.还可以表示“行不通、没用、进行不下去。”
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