《Learning about Language》PPT课件优质课下载

《Learning about Language》PPT课件优质课下载

【简析】在谓语动词 is 之前；引导词 when在从句中

作时间状语。从句作主语时谓语动词一般

用单数。

1. Exactly when the potato was introduced into

Europe is uncertain, but it was probably around

1565. （2014·全国大纲卷,单选改编，24）

【简析】在谓语动词excites之前；从句结构及意义均完整，故需要“无成分，无意义的”引导词 that。that引导主语、表语、同位语从句时一般不可省。

2. That we will have a picnic next Sunday

excites us all these days.

【知识拓展一】常用it作形式主语的基本句式

（1）It + be +?名词?+ that从句；?

（2）It + be +?形容词?+ that从句；

（3）It + be +?动词的过去分词?+ that从句；

（4）It +?不及物动词?+ that?从句。

3. It is unimaginable that it could ever be cleaned

up.（2014·新课标卷，语法填空改编，61）

【简析】本句中It作形式主语，替代后面真正主语从句

在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有：

【知识拓展二】

It is necessary (important, natural, strange, etc.) that …? It is a pity (a shame, no wonder, etc.) that…? It is suggested (requested, proposed, desired, etc.) that…

【经典例句】宾语从句（这是新高考重点考查的句式）

I’m sorry to say （that） I cannot go to the bookstore with you on Friday afternoon.

I hope that the change will not cause you too much trouble.

（ 2016·全国卷III,书面表达范文）

【简析】本段当中用到多个宾语从句，that在宾语从句中不担当句子成分。当一个动词带有两个或两个以上宾语从句时，第一个that可以省略，第二个that不可以省略。