当主句谓语是过去时态，从句中的时态一般用表示过去的某种时态。如：

He said there were no classes yesterday afternoon. 从

句是一般过去时

He said (that) he was going to take care of the baby. 从句是过去将来时

He said (that) they were having a meeting at that time. 从句是过去进行时

当主句谓语是过去时态，而宾语从句叙述某一客观真理（事实）时，宾语从句的时态则用一般现在时。如：

The teacher told us(that) nothing is difficult if you put your heart into it.

老师告诉我们世上无难事只怕有心人。

He said that light travels much faster than sound. 他说光传播比声音传播快得多。

2. 否定转移

1) 将think, believe, suppose, expect, fancy, imagine等动词后面宾语从句的否定词转移到主句中，即主句的谓语动词用否定式，而从句的谓语动词用肯定式。

I don''t think I know you. 我想我并不认识你。

I don''t believe he will come. 我相信他不回来。

注意：若谓语动词为hope,宾语从句中的否定词不能转移。

I hope you weren''t ill. 我想你没有生病吧。

2) 将seem, appear 等后的从句的否定转移到前面。

It doesn''t seem that they know where to go.看来他们不知道往哪去。

It doesn''t appear that we''ll have a sunny day tomorrow. 看来我们明天不会碰上好天气。

三．表语从句

表语从句在复合句中作表语的名词性从句，放在系动词之后，一般结构是“主语＋连系动词＋表语从句”。可以接表语从句的连系动词有be, look, remain, seem等。引导表语从句的that常可省略。另外，常用的还有the reason is that 和It is because 等结构。例如：

1) The question is whether we can make good preparation in such a short time.

2) This is why we can''t get the support of the people.

3) But the fact remains that we are behind the other classes.

4) The reason he is late for school is that he missed the early bus.

四. 同位语从句

同位语从句就是在复合句中作名词的同位语的名词性从句。

1.同位语从句的功能

同位语从句对于名词进一步解释，说明名词的具体内容，一般由that引导，例如：

1) The king''s decision that the prisoner would be set free surprised all the people.

2) The order that all the soldiers should stay still is given by the general.

2．同位语从句与定语从句的区别

(1) 定语从句中的that既代替先行词，同时以在从句中作某个成分（主语或宾语），而同位语从句中的that是连词，只起连接主句与从句的作用，不充当句中任何成分。

(2) 定语从句是形容词性的，其功能是修饰先行词，对先行词加以限定，描述定的性质或特征；同位语从句是名词性的，其功能是对名词进行补充说明。例如：

1) The news that he told me is that Tom would go abroad next year.（他告诉我的消息是汤姆明年将出国。）（第一个that引导的从句是定语从句，that在从句中作宾语）

2)The news that Tom would go abroad is told by him.（汤姆将出国的消息是他讲的。）（同位语从句，that在句中不作任何成分）

Key words and phrases