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选修七《Unit 2 Global Warming Section 3： GRAMMAR IN USE》优秀ppt课件
3. To find your way can be a problem.
2. Smoking is bad for you.
1. You are a student.
4. “How do you do?” is a greeting.
5 .What she said is not yet known.
6. That we shall be late is certain.
7. It is certain that we shall be late.
Subject（主语）
A sentence serving as subject is called Subject Clause.
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。
How the book will sell depends on its author.
That he is the best student in the class is
obvious.
引导主语从句的关联词有三类： (1)????从属连词that。 如：That they were true
sisters was clear from the facial
resemblance between them. 很明显，她们确是亲姐妹，她们的脸型很相似。 (2)????从属连词whether。如： Whether he’ll come here isn’t clear.??
他是否会来这里还不清楚。 (3)????连接代词who, whom, whose, what,
which, whoever, whatever, whichever 连接副词 where, when, how, why。如： What she did is not yet known.??她干了什么尚不清楚。 How this happened is not clear to anyone.
这事怎样发生的，谁也不清楚。 Whoever comes is welcome.??不论谁来都欢迎。
二. it 做形式主语
为了防止句子头重脚轻，通常把形式主语it放在主语
位置，真正主语搁置于句末。