Unit 4 教学设计5-公开课-优质课(人教必修3精品)

Unit 4 Astronomy: the science of the stars

教学案5

Period 1 Grammar points.

一．语法要点

主语从句：在复合句中作主句的主语的从句叫主语从句。引导主语从句的词有连词that, whether;连接代词who, what, which;连接副词when, where, how, why等。

Eg: Which team will win the match is still unknown.

主语从句放在句首，句子常显得笨重，因此一般把它放到句子后面，前面用引导词it来作主语。

Eg: It’s strange that he didn’t come yesterday.

二．重点难点

1．Nobody knew that it was going to be different from other planets going to be different from other planets going round the sun.

going round the sun 为现在分词短语定语，表示一般的动作。

Eg: Men breaking the law will be punished.

现在分词短语，也可表示进行的动作

2. Weather life will continue on the earth for millions of years to come will depend on whether this problem can be solved.

for millions of years to come 中不定式to come 作定语，与前面的名词有逻辑上的主谓关系。Eg: She is the last person to tell lies.

3．The problem was that the earth became violent because it was not clear whether the solid shape was to last or not.

The problem was that …, that 引导表语从句，that 只起连接作用，无意义，但不能省略。Eg: The trouble is that we are short of money.

4．As the earth cooled down, water began to appear on its surface.

as conj. 随着，在…期间;由于，因为;尽管，即使;当…的时候;像…一样

5. That made it possible for life to begin to develop.

it 是形式主语，真正的主语是不定式to begin to develop.