1. The doorbell is ringing.
    门铃响了.

2. I had no sooner got back to the kitchen than the doorbell rang loud enough to wake the dead.
    我刚回到厨房，门铃又响了起来，响声足以把死人唤醒。

3. I tried to wake up my wife by ringing the doorbell, but she was fast asleep,
    我按响了门铃，试图唤醒我的妻子，但她睡得很熟。