1. He brought three friends of whom none (none of whom) I had ever met before. 2.I bought a new bike, of which the colour( the colour of which) was blue. 3.He lived in a house, whose door faces south.
在定语从句中，除了that外，其他的都能引导非限制性定语从句： Do you know that man, whose house was on fire yesterday? Do you know that man, of whom the house was on fire yesterday? Do you know the house, of which the owner died in the fire last night?
