-it的用法及强调句型(精心整理)

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1、it的用法及强调句型it的用法一、it作指示代词【完成句子】用one，ones，it，that，those填空(1)—Ican'tfindmywatch.　—Youhaven'tfound______？Ifyouwanttobuyanew______，Isuggestyoubuy______madeinChina.(2)We'vegotabigcupandtwosmall______.(3)Theweightofanelephantismuchgreaterthan______ofatiger.(4)Thebook

2、sonthefirstshelfareeasierthan______onthesecondshelf.(5)Theboytoldhisstoryand______ofthegirlupstairs.【答案】(1)it;one;one(2)ones　(3)that(4)those/theones(5)that/theone【结论1】①指代上文提过的事物时，it指的是同名同物，相当于the＋名词；②one指的是同名异物，表示单数可数名词相当于a＋名词；a/an＋形容词＋one等于a/an＋形容词＋名词；复数形式用on

3、es；③that后面常有后置定语，有特指意义，代替不可数名词或单数可数名词，相当于the＋名词；④复数名词用those，相当于theones。【例句观察】—Someoneisknockingatthedoor.Whoisit?—ItmustbeLeo.Hesaidhe'dcometoseeme.【结论2】it指代人时，常指小孩或身份不明的人。【例句观察】It'stooquietintheroom.Everyonejustkeepssilent.【结论2】it可用以指代环境或情况。(6)—Whattimeisitno

4、w?—It'shalfpastseven.(7)—Itisspringnowandit'swarmthesedays.【结论3】it可用以指代时间、季节、天气或距离。【注意】it指代时间时，有如下一些句型：(1)Itistimeforsth.(forsb.)todosth./that－从句(shoulddo/did,必须用虚拟语气)例：①It'stimeforlunch.②It'stimeforustocleanthehouse.③It'stimethatweshouldcleanthehouse.＝It'stim

5、ethatwecleanedthehouse.(2)Itis/hasbeen＋sometime＋since－从句(从句用一般过去时)Itis10yearssinceIgraduatedfromcollege.(3)It/This/Thatisthefirst/secondtimethat－从句(必须使用现在完成时)这是某人第……次做了某事。It/This/Thatwasthefirst/secondtimethat－从句(必须使用过去完成时)例：①Itisthesecondtimethatshehasvisited

6、theGreatWall.　②ThiswasthefirsttimethatIhadcomelatetoschool.(4)Itwas＋时间点＋when－从句例：Itwaseveningwhenwegothome.　＝Itwaseveninginwhichwegothome.(5)Itwas/willbe＋sometime＋before－从句例：①过了5年他们才从北大毕业。ItwasfiveyearsbeforetheyfinallygraduatedfromBeijingUniversity.②不久，我们就要从我

7、们学校毕业了。Itwon'tbelongbeforewegraduatefromourschool.二、it作形式主语1.代替主语从句①Itisclear(obvious，true，possiblecertain....)that.....“清楚（显然，真的，肯定．．．）”　②.Itisimportant(necessary，right，strange，natural...)that...that后的从句中要用虚拟语气（should+动词原形），should可以省去，建议记住该句型中的形容词。3Itisimport

8、antthatwe(should)learnEnglishwell.③Itissaid(reported，learned....)that...据说（据报道，据悉．．．）“。　　ItissaidthathehascometoBeijing.④.Itissuggested(ordered/demanded/insisted/commanded...)that.