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us.我們需要更多的設(shè)備,這是很明顯的。主語從句的引導詞that什么時候可以省略當主語從句不太長時,引導詞“that”可以省略。如:It’s clear (that) he has done his best.很明顯他已經(jīng)盡力而為了。It’s a wonder (that) he didn’t fail.真奇怪,他沒有失敗。以whether引導的主語從句Whether he will join uswon’t make too much difference.(It’s won’t take too much difference whether he will join us.)他是否加入我們,沒有太大的差別。以if引導的主語從句以if引導的主語從句不能放在句首,只能采用外置形式,It is doubtfulif he will e.It is doubtfulwhether he will e.Whether he will e is doubtful.他是否會來值得懷疑。以because引導的主語從句because很少用來引導的主語從句,只能用于“Just because...doesn’tmean”句式中,才能引導主語從句。Justbecausesomeone’sbeenarrestedfordomesticviolencepriordoesn’tnecessarilymeanthatthey’reguiltyofaheinouscrime.Ofcourse,justbecausehe’dagreedtothemdidn’tmeanheplannedtoabidebythem.it作形式主語的主語從句1主語從句可以用 it 作形式主語。常以it作形式主語的句型有以下五種:(1)It + be +形容詞+ that 從句。Itiscertainthatshewilldowellinherexam.毫無疑問她考試成績會很好。Itisprobablethathetoldhereverything.很可能他把一切都告訴她了。以下是適合本句型的形容詞:obviousnaturaltruesurprisingfunnygoodwonderfulpossiblelikelyit作形式主語的主語從句2(2)It + be +名詞詞組+ th