我昨晚睡不着，因为隔壁太吵了。

I ___couldn't sleep last night because the neighbors were too noisy.

我昨天找不到我的钥匙，所以进不了家门。

I ___couldn't find my keys yesterday, so I couldn't get into the house.

你能帮我拿一下那个盒子吗？

___Couldn't you help me carry that box?