2019-2020学年人教版高中英语必修3优化学案:Unit 4 Astronomy the science of the stars Period 6
2019-2020学年人教版高中英语必修3优化学案:Unit 4 Astronomy the science of the stars Period 6第2页

 为保持句子平衡,常把主语从句后置,而用形式主语it代替。it作形式主语时常用句型:

It+系动词+形容词+that从句 常用于此句型的形容词有important,(un)likely,possible,necessary,natural,wrong等。 It+系动词+名词+that从句 常用于此句型的名词有fact,idea,honor,question,pity等。 It+系动词+过去分词+that从句 常用于此句型的分词有known,proved,said,decided,suggested,thought等。 It+特殊动词+that从句 常用于此句型的动词有appear,happen,seem,occur等。  It's possible that he has been to Beijing. 他有可能去过北京。

 It's a pity that you didn't attend the meeting. 你没参加这次会议太可惜了。

3.主语从句中应注意的问题

(1)从句的语序要用陈述语序。

Whoever leaves the room last is expected to turn off the lights.

 无论谁最后离开房间都要关灯。

(2)从句作主语时,主句的谓语一般用单数形式。有时受表语的影响用复数形式。

What you said just now is quite right. 刚刚你说的话很对。

What he wants to read now are some magazines. 现在他想读的是一些杂志。

(3)从句的时态一般要取决于主句。

What made people excited was that the solar ship had completed around­the­world trip.

让人们激动的是太阳能船已完成了环游世界的旅行。

当堂达标练习:

Ⅰ.完成句子

1.__________ (据报道) some people were killed in the downtown.

2. ____________ ______ (她生了一个健康的婴儿) made the family very happy.

3.____________ _________ (父母是否给他买一台新电脑) depends on his exam results.