There is no one who is not conccrned about his future. (= There is no one but is concerned about his future.) 没有人不关心自己的未来?
　　2. 定语从句中有can, will, shall, must, may, should, ought to等助动词或情态动词,在将其改为含but的复合句时,这些助动词或情态动词后面不能再有not
　　There is nothing that she can’t do. (= There is nothing but she can do.) 没有她做不到的事?
　　3. 定语从句中有助动词do, does, did, 在将其改为含but的复合句时,应去掉do, does, did, 还原其后动词的时态及人称变化
　　There is no one who doesn’t wish to make great achievements. (= There is no one but wishes to make great achievements.) 谁都希望自己将来能有所成就。
四、which的先行词：关系代词which的先行词可以是一个句子
　　He said he saw me there, which was a lie。他说在那儿看到了我，纯属谎言。
说明：关系代词that在从句中作宾语或表语时可省略
　　I've forgotten much of the Latin I once knew。 我过去懂拉丁语，现在大都忘了。