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When+doing的用法Everyteachershould,therefore,followinhisfootstepsandemphasizebenevolencewhenteaching.因此，每个老师教学时，应效法孔子并强调仁的道理。=Everyteachershould,therefore,followinhisfootstepsandemphasizebenevolencewhenheteaches.在以when,while,if,once,though,unless等六个连词引导的状语从句中，若主语与主句的主语相同时，可将从句中的主语删除，并将之后的动词变成现在分词。若是be动词，一律变成分词being,而being再予以省略。1.whenyoudothework,youshouldbecareful.=Whendoingthework,youshouldbecareful.2.IfIamfree,I'lldoit.=Iffree,I'lldoit.3.whenyoudothework,youmustbecareful.=Whendoingthework,youmustbecareful.4.Thoughheispoor,heishappy.=Thoughpoor,heishappy.5.WhileIwaswatchingTv,Ifellasleep.=WhilewatchingTV.Ifellasleep.6.Whenyoudriveacar,youshouldbealert.=Whendrivingacar,youshouldbealert.