形式主语it的用法课件

用来表示天气，It+be+adj+不定式(todo)(important，日期，known，一人称代词It最基本的用法是人称代词，时间，It做非人称代词1，impposible)ItisdangeroustodrivetoofastitisimportanttokeepahealthydietIt+be+adj+that从句ItissurprisingthatheiscomingthisafternoonItisstrangethatyougaveupthechancetogoabroad2It’s+n+todo/that从句ItisagoodhabittogetupearlyinthemorningItisapitythatyoucannotgotothepartytonightItisgoodnewsthatwewillmovetothenewschoolsoonIt’s+过去分词+that从句(said，necessary，strange，thought，usnual，距离等ItisWednesdaytodayItisrainythesedays---Whattimeisit?----Itis2o’clocknowItisfivekilometersfrommyhometotheschool?It做形式主语1，reported，主要代表刚提到的东西以避免重复，HeboughtabookandgaveittomeThesnakeisnotawarm-bloodedanimalItisacold-bloodedanimalIt代人的情况1)whatalovelybabyHowoldisit?2)---whoisit?---ItisMrBlackSpeaking(telephonecall)3)---Whoisknockingatthedoor?----It’sme二，right，believed，decided)Itisreportedthat6peoplewerekilledinthat，