You took the wrong key. ✬

It was careless of you to lose the key. ✬

Where was it that you found this key? ✬

I have a spare key to my house hidden outside. ✬

If I lost my key, I wouldn't be able to lock the door. ✬

Where did you find the key? ✬

I lost the door key, so I can't enter the house. ✬

The key is on the desk. ✬

Don't play with that key! ✬

Can I have the key now, please? ✬