【大学英语四级考点四：】关系代词必须用that的情况
1．当先行词是everything，anything，nothing，something，all，none，few，little，some等不定代词时，或当先行词被every，any，all，some，no，little，few，much等不定代词修饰时。
We should do all that is useful to the people.
2．先行词被the only，the very，the same，the last等词修饰时。
This is the last place that I want to visit.
3．先行词是最高级或被最高级修饰时。
This is the best novel that I have ever read.
4．先行词是序数词或被序数词修饰时。
This is the second time that you told us the story.
5．当先行词同时含有人和物时。
We talked about the things and persons that we were interested in.
6．以who或which开头的特殊疑问句中，含有定语从句，为避免重复时。
Who is the man that is standing under the tree?
注意：Qingdao is the most beautiful city where I have ever worked.(即使有最高级修饰先行词city，但从句中work为不及物动词，先行词只作其地点状语，故要用关系副词)因此牢记，前面所述几种情况已有前提：需要用关系代词时，遇到这几种情况才选用that。
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