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IwillneverforgetthepeopleandthethingsIsawonthatrainynight.that关系词只能用that先行词即有人，又有物先行词为anything,nothing,much,little,all先行词由序数词，最高级修饰IsthereanythingthatIcandoforyou?Armstrongisthefirstpersonthatsteppedonthemoon.先行词有theonly,thevery,thelast修饰TheonlypersonthatIcareaboutisyou.当主句以which或who开头WhoisthepersonthatfirststeppedonEverest.