文档介绍：高考英语核心语法学案: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)Thebooksonthefirstshelfareeasierthan______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ones;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】—?—'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'.【结论2】it可用以指代环境或情况。【完成例句】[]根据语境补全句子(6)—Whattimeisitnow?—It'shalfpastseven.(7)—Itisspringnowandit'swarmthesedays.【结论4】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'stimethatwecleanedthehouse.(2)Itis/hasbeen+sometime+since-从句(从句用一般过去时)(3)It/Thisisthefirst/second…timethat-从句(必须使用现在完成时)这是某人第……次做了某事。It/Thatwasthefirst/second…timethat-从句(必须使用过去完成时)例:①ItisthesecondtimethatshehasvisitedtheGreatWall. ②elatetoschool.(4)Itwas+时间点+when-从句例:Itwaseveningwhenwegothome. =Itwaseveninginwhichwegothome.(5)Itwas/w