人教高中英语必修3Unit4 Astronomy: the science of the stars Subject Clause课件 （共31张PPT）

(共31张PPT)
subject clauses
Jane is good at playing the piano.
To see is to believe.
Smoking is bad for health.
What he has said is true.
Find the subject
(名词)?????
（不定式）
（动名词）
(从句）

What she said is not yet known.
That we shall be late is certain.
Find out the subject clause
主语从句 (Subject Clause)
充当主语的句子就是主语从句。
引导词：
从属连词 that, whether；
连接代词 who, what, which；
whoever, whatever, whichever;
连接副词 when, where, how和why。
That he will come is certain.
Whether he will come is uncertain.
引导词
1) 从属连词that和whether：

whether 不做成分，表“_______”
that
是否
不做成分，
无意义，
不能省略。
________ the experiment is worth doing is uncertain .

________ I hate cats is known to my friends.
Whether
That

What we need is more time.
Which book I shall choose hasn’t been decided.
2) 连接代词who, what, which, whoever, whatever, whichever, whom, whose
引导词
What/ which在主语从句中做主语或宾语.
which意为“哪个、哪些”,使用which在前文必须有范围.
________ is the best book among these three books remains a question.

________ the student want to do remains a question.
Which
What
Whoever breaks the law will be punished.
Whatever he did is right.
引导词
whatever=anything that
whoever=anyone who
________ returns the purse back will get a sum of money.
替换为定语从句：
________________ returns the purse back will get a sum of money.
Whoever
Anyone who
Why he cries is not clear.
Where the meeting will be held is not known.
3) 连接副词when, where, how ,why
引导词
It is certain that he will win the match.
That he will win the match is certain.
注解：一般来说主语从句都是放在 ,
但有时为了使句子 ,避免”头重脚轻”,
常用 作 ，从而把主语从句放在
．

句首
保持平衡
it
形式主语
后面
it 做形式主语，真正主语位于句末
1) It is + adj. +that
　
It’s certain that… 肯定…
　 It is obvious/clear that… 很明显…



*_______________(很可能)she will come back tomorrow.
*_______________(很明显) he is an English.
It is possible that
It is obvious that

2) It is + n. +that

　 It is a pity that... 可惜的是……
　 It is common knowledge that … …是常识



*_______________(很可惜)we lost the match.
*______________(这是事实)he cheated in the exam.
It is a pity that
It is a fact that
3) It + be +过去分词+从句

It is said that... 据说……
It is suggested that + (should）do... 建议……



*_________________(据报道)20 people were killed in the accident.
*__________________(建议)we should eat more vegetable and do more exercise.
It is reported that
It is suggested that
4) It +不及物动词+that

It happened that... 碰巧……
It turned out that… 原来…

*________________(刚好)I was out yesterday.
*____________________(我突然想起)I forgot to sent the letter.
It happened that
It occurred to me that
他何时要来还不清楚。
When will he come?
It is not clear.

When he will come is not clear.
Features
特点一：主语从句一律用陈述语序，即主语在前，谓语在后。
1. What he needs ___ that book.
2. What he needs ____some books.
特点二：多数谓语动词为单数，有时也通过表语确定单复数。
is
are
Features
When the meeting will begin _____ (have) not been decided yet .
has
When they will start and where they will go _____(be) still unknown.
are
他是不是我的孩子仍然是个问题。
Whether he is my child remains a question.
What I like most is your hairstyle.
我最喜欢的是你的发型。
What I need is rest.
我需要的就是休息。
It is believed that the word diaosi reflects social problems.
据认为“屌丝”这个词反映了社会问题。
How Du Lala becomes successful depends on her hard work.
杜拉拉如何成功取决于她的勤奋。
What the boy did made the teacher angry.
这个男孩所做的事让老师很生气。
It is common knowledge that we should wear rain shoes on rainy days.
雨天要穿雨鞋（rain shoes）是常识。
What do you think of grammar learning?
How can you learn grammar well?
In my opinion, it is very important __________ ___________ (我学好语法) because it can help me with my writing and my sentence structure. _____ is known to all that grammar is really a bridge to success. Believe it or not, it doesn’t matter _______ we can recite all those grammar rules. _______ we need to do is try to understand and use the language.
It
whether
What