5、…that..去掉句子仍然成立。It is (was) 被强调部分+ that (who) + 句子其他部分。此结构强调的成分仅限于主语,宾语和状语原句:Myfatherdidtheexperimentinthelabyesterdayevening.强调主语:Itwasmyfatherwhodidtheexperimentinthelabyesterdayevening.强调宾语:Itwastheexperimentthatmyfatherdidinthelabyesterdayevening.强调时间:Itwasyesterdayeveningthatmyfath