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             1.It was Mary who did the experiment in the lab   yesterday evening. 
            2.It was in the park that I met my old teacher yesterday. 
            3.It was yesterday that I met my old teacher in the   park. 
            4.It was my old   teacher that I met in the park   yesterday. 
            5.Maria,do tell us a little about the Venice Film Festival. 
            6.It was then that Robert Redford became its   sponsor and changed the focus to independent films,often   made on very modest budgets. 
            7.We show films from many countries,though   we do give some special awards to   Canadian films. 
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             1.所有例句都表示强调。 
            2.表示强调有两种表现形式。一种是用“do/does/did+动词原形”表示,如例句5,7;另一种是用强调句型“it's...that...”表示,如例句1,2,3,4,6。 
            3.强调句型中,例句1强调主语Mary;例句2强调地点状语in_the_park;例句3强调时间状语yesterday;例句4强调宾语my_old_teacher;例句6强调时间状语then。 
            4.例句5强调谓语动词tell;例句7强调谓语动词give。 
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