我没有锁门，因为钥匙本身就是一项发明(现代锁和钥匙于1776年发明)。
I'm abandoning my home. I didn't lock the door because keys are an invention (the modern lock and key was developed in 1776).
我突然想起来我还没有锁门呢。
It suddenly occurred to me that I had forgotten to lock the door.
如果我知道你没有钥匙，我就不会锁门的。
If I had known you didn't have a key, I wouldn't have loked the door.
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