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1、Unit4Astronomy:thescienceofthestarsGrammarThesubjectclause主语从句主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。1． 引导主语从句的连接词有三类：(1)连词that、whether：That they were in truth sisters was clear from the facialresemblance between them.Whether he’ll come here isn’t c
2、lear.Thatpricewillgoupiscertain.Whetherwegobytrainorbyboatmakesnodifference.Whowillwritethepoemhasnotbeendecidedyet.Whateverhedidisright.What she did is not yet known.Whoever comes is welcome.Whicheveryouwantisyours(2)连接代词who, whom, whose, what, which, whoever,
3、whatever, whichever等3)连接副词where, when, how, why等。How this happened is not clear to anyone.Wherever you are is my home ---- my only home.Whenhewillbebackdependsontheweather.Wherewelivedoesn’tmatter.Howthepyramidswerebuiltwasstillamystery.A.It+be+形容词(obvious, true
4、, natural, surprising, good, wonderful, funny, possible, likely, certain, probable,etc.)+that从句。如：It is certain that she will do well in her exam.It is probable that he told her everything.B.It+be+名词词组(no wonder, anhonour, a good thing, a pity, no surprise,etc.)
5、+that从句。如：It’s a pity that we can’t go.It’s no surprise that our team should have won the game.2.用it作形式主语的结构C.It+be+过去分词(said, reported, thought, expected, decided, announced, arranged,etc.)+that从句。如：It is said that Mr. Green has arrived in Beijing.It is reporte
6、d that China has sent another man－made earth satellite into orbit.D.It+seem, happen等不及物动词及短语+that从句。如：It seems that Alice is not coming to the party at all. AliceIt happened that I was out that day.E.It+doesn’tmatter (makes no difference, etc.)+连接代词或连接副词引起的主语从句。
7、如：It doesn’t matter whether she will come or not.It makes no difference where we shall have the meeting.F.当that引导的主语从句出现在疑问句中时，要以it作形式主语，而把主语从句后置。如：Is it true that the scientist will give us a lecture next week?Does it matter much that they will not come tomorro
8、w?G.当主语从句出现在感叹句中时，要以it作形式主语，而把主语从句后置。如：How strange it is that the children are so quiet!3.主语从句不可位于句首的五种情况：（1）if引导的主语从句不可居于复合句句首。（2）Itissaid/reported…结构中的主语从句不可提前。例如：I
