scientist
Answer key for exercise 2 on page 28
1. At the beginning, the earth had no_______. C A dust B atoms C water D matter 2. The devy depends on _______ A combining together.
为了防止句子头重脚轻，通常把形式 主语it 放在主语位置，真正主语后置。 1. It is certain that he will win the match. 2. It is true that he has made a very important discovery in chemistry. 3. It is very likely that they will hold a meeting.
主语从句 (Subject Clause)
如果一个句子在复合句中充当一个主语,
那么这个句子就是主语从句。
That he finished writing the composition
in such a short time surprised us all. What we need are good doctors. Whom we must study for is a question of great importance.
连接词
4. what What you need is more practice. 5. which Which one is the best is not clear. 6. when, where Where he has gone is a question. 7. why, how Why there is gravity is hard to understand. How he can earn a living in Britain remains a big problem.
3. whether从句作介词宾语 I’m not sure about whether we’ll win. 4. 引导让步状语从句时 Whether you like it or not, you’ll have to do it.
注意事项
1. 主语从句位于句首时必须由连接词 引导。 2. 主语从句后置时引导词that可省略。 3. 主语从句位于句首时,不能用if 引导。 4. 主语从句后置时, 可以用if引导。
Unit 4
1.To learn the prefix and suffix. 2.To learn howto use words to finish a passage.. 3.To remember the words.
Discovering useful words and expressions
小结
1. 以that 引出的主语从句,常以形式
主语it引导, 结构为: It is +形容词/
名词/某些动词ed + that 从句。 2. 在有些that从句中要用虚拟语气
(should +do/should +have done)。
whether与if均为“是否”
但下列情况下只用whether ： 1. 引导主语从句并在句首 Whether he will come is not clear. 2. 引导表语从句 The question is whether he’ll come.
4. It is strange that the man should have stuck to his silly ideas. 5. It is a pity that we won't be able to go to the south to spend our summer vacation. 6. It is still a mystery what caused the accident. 7. It is said that he has gone to Shanghai. 8. It seems that he has seen the film.
上面的空大家都填对了吗?
上面每个句子都出现了的主 语从句，大家能找到吗？
1. Whose watch was lost is unknown.
2. Whatever you did is right. 3. Whether we will go for an outing tomorrow remains unknown. 4. What we need is time. 5. Who will be our monitor hasn't been decided yet.
A atoms B rocks C gases D water
C 3. The ________ of mammals happened after the disappearance of the dinosaurs.
A harmful B system C spread D method
B 4. Mammals ________ when the animals that were harmful to them disappeared.
Answer key for exercise 1 on page 28
present—presence violence violent confident confidence different difference patient patience certain fair paid like kind uncertain unfair unpaid unlike unkind
Answer key for exercise 4 on page 28
Violent patient gentle angry rude relaxing kind shocked excited easy-going calm crazy
Emotional words
Calm words
Violent angry rude Shocked excited crazy
A prevented B multiplied C depended D existed
Answer key for exercise 3 on page 28
Is the moon a planet? This question is fundamental _________ if students are to show that they understand the nature of __________. astronomy Some scientists think that the earth __________ gave birth to the moon because the moon circles our planet. Others believe that the moon ______ existed before the earth was formed. They think that earlier in time it travelled through space as a small planet which was caught by the earth’s gravity. __________, As a result it goes around our planet.
culture globe universe agriculture mathematics art physics chemistry biology science
cultural global universal agricultural
mathematical
Artist physicist chemist biologist
The evidence for this theory is that the atoms that make up the rocks on the moon _______ seem to be different from those on earth. What is clear is that the moon is smaller than the prevents it _____ from escaping earth and this ________ from the earth. Although its origin may still be a ______, puzzle the moon can never be anything more than a satellite of the earth.
1. Whose watch was lost is unknown.
2. Whatever you did is right. 3. Whether we will go for an outing tomorrow remains unknown. 4. What we need is time. 5. Who will be our monitor hasn't been decided yet.
2.Your have made a mistake is a fact.
Patient gentle relaxing Kind easy-going calm
Unit 4 Grammar
Noun clauses as the subject
Use the words below to fill in the blanks.
whether what who whose whatever 1. ______ Whose watch was lost is unknown. 2. Whatever ________ you did is right. 3. _________ Whether we will go for an outing tomorrow remains unknown. 4. ______ What we need is time. 5. ______ Who will be our monitor hasn't been decided yet.