聪明反被聪明误，只因乱用关系副；
关系副，关系副，定缺主宾它不住；
它不住，它不住，关系代词来玩酷；
关系副词在定语从句中是做状语的，where做地点状语，when做时间状语，why做原因状语，但要特别注意，如果定语从句中所缺的不是状语，而是主语、宾语或表语，就不要用关系副词，而要用关系代词。例如：
1) I still remember the days _____ we spent together in the mountains last summer.
先看定语从句中所缺少的句子成分，spent是及物动词，缺宾语，因此不能填when, 而要用关系代词which或that。
2）This is the house ______ his grandfather once lived in.
先看定语从句中所缺少的句子成分，lived in, 明显缺宾语，in是介词，介词后应该有宾语，所以不能填where, 而要用which或that。
3）Is that the reason _______ you explained to the teacher for your being late for school?
先看定语从句中所缺少的句子成分，explain后应该跟双宾语，缺少一个宾语，因此不能用why, 而要用which或that。
10.只记上边不可以，特殊情况告诉你；
先行用way 做状语, in which/ that /略可以，
先行词是way, 表示方式，在定语从句中做方式状语，其后的关系词可以有三种处理方式，即：in which/ that 或省略。
例句：
I like the way he smiles.
I like the way that he smiles.
I like the way in which he smiles.
one of +复做先行，从中谓语复数明，
one前若有only/ very, 从中谓语定用单；
例句：
Ling Qing is one of the volunteers who are ready to go to the countryside.
Ling Qing is the only one of the volunteers who is ready to go to the countryside.
定从名从可转换，all that被 what换；
名词性从句中的what/whatever/whoever等词，在句中做主语、宾语或表语时，可以转换成定语从句。例句：
1) I don’t believe whatever he says.= I don't believe anything (that) he says.
2) Whoever breaks the law will be punished.= Anyone who breaks the law will be punished.
3) The driver didn’t hear what the policeman said. = The driver didn’t hear the words that the policeman said.
4) The students can do all (that) they can to help the old teacher. = The students can do what they can to help the old teacher.