1.先行词是不定代词或被不定代词修饰（some,any,none,both,all,neither,something,anything等）由 some-,any-,no-,ever-和-thing,-one,-body组合成的词
This is all 【 】I can tell you.
步骤：空前到句末--tell sb sth 缺宾--空前all---用that
2.先行词被最高级、序数词修饰(the very.the only,the just,the last修饰时）
My father is the only man 【 】I love.
步骤：空前到句末--love sb 缺宾--the only---用that
3.先行词既有人又有物
I wil never forget the people and the things 【 】 I met in the school.
步骤：空前到句末--met + 宾语 缺宾--the people and the things---用that
4.以who/which开头的疑问句
Who is she 【 】stands there?
步骤：空前到句末--缺主语 she--Who---用that
