上海中考英语句型转换讲解与练习(1)

上海中考英语句型转换讲解与练习

【考点讲解】

一、肯定句改为否定句

在做此类题时，通常在系动词、助动词和情态动词后加not (n't)。如果句中没有这些词，则根据谓语动词的原形、第三人称单数动词形式或过去式而分别在其前面加do not (don't), does not (doesn't) 或did not (didn't), 并将第三人称单数动词形式或过去式改为原形。如：

We can finish the work this afternoon. →We can't finish the work this afternoon.

They put the basket under the tree just now. →They didn't put the basket under the tree just now.

注意：

1. 当think, believe, suppose等动词后面跟宾语从句时，通常用否定主句谓语动词来达到否定从句谓语动词的目的。如：

I thi nk they can come tonight. →I don't think they can come tonight. 2. 当must表示推测，表示“一定；肯定”的含义时，否定句应用can't。如：He must be in the room. →He can't be in the room.

二、陈述句改为疑问句

陈述句改为疑问句一般有三种情况：一是改为一般疑问句，二是改为反意疑问句。如:

1.The students had learned about 1,000 English words by the end of last term. （改为一般疑问句）

→Had the students learned about 1,000 English words by the end of last term?

2.The twins have never been to the Summer Palace, have they? （完成反意疑问句）

三、对划线部分提问

对划线部分提问，就是用一个合适的疑问词去替代句中的某一成分，使之成为一个特殊疑问句。当对主语或主语的定语提问时，用陈述句语序。对定语提问时，所修饰的名词应放在疑问词后。对其他成分提问，用“疑问词+一般疑问句语序”。如：

1.Tom will be back in ten days. （对划线部分提问）→Who will be back in ten days?

2.He writes to his father once a month. （对划线部分提问）→How often does he write to his father?

3.The runner fell behind the others though he did what he could.

The runner to keep up with the others though he his .