that必用
1先行词是最高级或被最高级修饰
2是序数词或被序数词修饰
3不定代词指物
5被only；the every，no，one of等修饰
6主句有which；who；whom
7there be 句型中
8如果有两个从句，其中一个关系代词已用了which,另一个关系代词宜用that
9先行词在主句中作表语，或者关系代词本身作从句的表语是宜用that
that在作宾语时可省
10.不是任何时刻关系词作主语宾语是能用that难点分析you.注意1：, the only，the same,the last ,any,little等修饰时(1) This is the very good dictionary that I want to buy,(2) After the fire in his house, the old car is the only thing that he owned.当先行词指人时，偶尔也可以用who(3) Wang Hua is the only person in our school who will attend the meeting？5、当先行词前面有who, which等疑问代词时(1) Who is the man that is standing there?(2) Which is the T-shirt that fits me most?6、当先行词既有人，也有动物或者物体时Can you remember the scientist and his theory that we have learned?7.当关系代词在定语从句中做表语The village is no longer the one that it used to be 10 years ago.8.当在which引导的定语从句as和which引导非限制性定语从句，有相同之处也有不同之处。具 a developing country.(2) He is from the south, as we can see from his accent.(3) John, as you know, is a famous writer.(4) He has been to Paris more than several times, which I don’t believe.注意：当主句和从句存在逻辑上的因果关系时，常用which。(5) Tom was always late for school, which made his teacher angry.3、当先行词受such, the same修饰时，常用as(1) I have never heard such a story as he tells.(2) He is not such a fool as he looks.(3) This is the same book as I lost last week.注意：当先行词由the same修饰时，偶尔也用that引导定语从句，但是和由as所引导的定语从句意思不同(4) She wore the same dress that she wore at Mary’s wedding. 她穿着她注意：定语从句such…as …与结果状语从句such… that…的区别：as在所引导的定语从句中作主语，宾语；that在结果状语从句中不做成分 (6)He has such a good laptop as I want to buy.
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