If I had known you wanted to go, I would have called you. 
  如果知道你要去,我就会听你了。 
   
   
  Had I known you didn't have a key, I wouldn't have locked the door. 
  如果知道你没有钥匙,我就不锁门了。 
   
   
  She would have gone with me, but she didn't have time. 
  她本来会和我一起去的,但她没有时间。 
   
   
  If I had asked for directions, I wouldn't have gotten lost. 
  如果我问一下路,就不会走丢了。 
   
   
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