高中英语必修三Unit4：Learning about language.ppt

Discovering useful words and expressions;1. At the beginning, the earth had no_______. A dust B atoms C water D matter 2. The development of a planet generally depends on _______ combining together. A atoms B rocks C gases D water 3. The ________ of mammals happened after the disappearance of the dinosaurs. A harmful B system C spread D method 4. Mammals ________ when the animals that were harmful to them disappeared. A prevented B multiplied C depended D existed;Answer key for exercise 3 on page 28;The evidence for this theory is that the _______ 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 earth and this ________ it _____ escaping from the earth. Although its origin may still be a ______, the moon can never be anything more than a satellite of the earth.;;Noun clauses as the subject;1. ______ watch was lost is unknown. 2. ________ you did is right. 3. _________ we will go for an outing tomorrow remains unknown. 4. ______ we need is time. 5. ______ will be our monitor hasnt been decided yet.;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 hasnt been decided yet.;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 hasnt been decided yet.; 主语从句 (Subject Clause);连接词;4. what What you need is more practice.;8. whoever、whatever、whichever可引 导主语从句。 Whoever comes will be welcome. Whatever he did was right. Whichever of you comes in will receive a prize.;引导主语从句连词有that, whether, who, what, whatever等。 2. 连词位于句首不能省略。 3. 主语从句大多数情况下视为第三 人称单数, 但在关系代词what引导 的主语从句后谓语动词的数要根 据句意而定。;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。;4