UNIT2DISCOVERUSEFULSTRUCTURES语法课件高中英语人教版选择性必修第三册

B6U2Grammar不定式作主语Toseeistobelieve.百闻不如一见。Togetupearlyisnecessary.早起是必要的。Tolearnaskillisveryimportantforeveryoneinsociety. 1.Toseeistobelieve.

2.Togetupearlyisnecessary.1.动词不定式作主语单个不定式作主语时,谓语动词用___数。单Toseeistobelieve.百闻不如一见。Togetupearlyisnecessary.早起是必要的。Tolearnaskillisveryimportantforeveryoneinsociety. 1.Howtousethecomputeristhequestion.2.Wheretogohasnotbeendecided.2.疑问词who,whom,whose,what,which,when,where,how+todo不定式短语作主语时,谓语动词用___数。单Toseeistobelieve.百闻不如一见。Togetupearlyisnecessary.早起是必要的。Tolearnaskillisveryimportantforeveryoneinsociety. It’snoteasytoworkouttheproblem.=Toworkouttheproblemisnoteasy.3.用it作形式主语放句首若不定式太长,往往用it作_________,不定式后置。形式主语It’simportantforus__________(learn)Englishwell.tolearnIt’s+adj+forsb+todo(_________,_______,__________,______________…)difficulteasyimportantnecessaryItis+adj+for/ofsbtodosth.

1.Itisnecessaryforyoungstudentstolearnaforeignlanguage.2.

Itwassillyofyoutogiveupsuchagoodchance！It’s+adj+forsb+todo(_________,_______,__________,______________…)difficulteasyimportantnecessaryIt’s+adj+of+sb+todo(_______,_______,________,__________,________…)kindfoolishfriendlyrudepoliteItis+n.+(forsb.)todosth.

1.Itisapityforyoutomisssuchawonderfulfilm.

2.

Itisagreatfunforyoutovisittheexhibition.pity, shame, pleasure, one’sduty,fun, joy, goodmanners, badmannersIttakes/took/willtakesb.sometime/moneytodosth.做某事花费某人多长时间(钱)

1.Ittookmemorethananhourtodomyhomeworkyesterdayevening.