it 两种用法

1“it”用法做形式成分；用于强调句2第一部分It做形式成分：形式宾语和形式主语3一.it做形式宾语41.it指代宾语从句。1)IfindithardthatIlearneverysubjectwell.2)Ienjoyitwhenthesunshinesbrightly.52.it指代作宾语的不定式。Ifindithardtolearneverysubjectwell.Wefeelitourdutytomakeourcountrybetter.Aheartwithlovemakesitpossibletohelpothers.句式：主+谓+it+adj.+todo.6二.it做形式主语71.Itissaidthat…据说(known,reported,believed…)Itiswell-knownthatChinaisdevelopingveryfast.82.Itseems/appears/happensthat…似乎/看起来/碰巧Itseemsthatthestudentsareobedient(听话).Itappearsthatthestudentsarelisteningcarefully.93.It’sclear/obvious/evidentthat…明显It’spossible/likelythat…可能It’sclearthatteenagersarefondofmusic.It’slikelythatTomwillgotoanartcollege.104.It’snousedoingsth.It’snogooddoingsth.没用/没好处It’snousereadingwithoutthinking.It’snogoodlivingaimlessly.115.Itis+adj+todosth.1)ItisimportanttolearnEnglishwell.2)Whatfunitistohangout.(在外闲逛)12第二部分强调句13结构：Itis/was+被强调部分+that…常强调状语部分。14Tomwasbornin1998.一层次：变强调句Itwasin1998thatTomwasborn.二层次：变特殊问句WhenwasitthatTomwasborn?15三层次：作宾语从句Iforgot___.IforgotwhenitwasthatTomwasborn.宾语从句用陈述语序。16判断强调句：Itis/was…that…这个框架被拿掉，句子仍然成立。17常见的还有：Itwasnotuntil…that...直到…才Itiswhatsbdoesthat...某人做的事情…181.Itwasnotuntilmidnightthathewenttobed.2.Itiswhatyoudonotwhatyousaythatmatters.3.Itwasnotwhathesaidbutthewayhesaiditthatannoyedme.强调的成分是什么：(时间状语)(主语)(主语)