先行词为表示地点的名词且在定语从句中作状语时用where,先行词为表示时间的名词且在定语从句中作状语时用when,先行词为reason且在定语从句中作状语时用why.关系副词的使用场合有两种：

　　1.定语从句中,主,谓,宾成分完整时.

　　HewillrememberthedaywhenhejoinedtheParty.

　　2.定语从句中,谓语动词为不及物动词时.

　　Hewillrememberthefactorywhereheworkedtenyearsago.

　　Thisisthereasonwhyhewaslateforschool.

　　如果定语从句中,谓语动词为及物动词时,它后面又没有宾语时,就要用关系代词.

　　Hewillrememberthedaywhichhespenttogeherwithus.

　　Hewillrememberthefactorywhichhevisitedlastyear.

　　Thisisthereasonwhichhegave/explainedforhisbeinglatefor

　　school.

　　inwhich引导定语从句,作状语.

　　Hewillrememberthefactoryinwhich/whereheworkedtenyearsago.

　　Idon'tlikethewayinwhichhespoketohisfather.