1. 简单过去未来式表示对于过去某一时间而言,即将或预计要发生的动作或存在的状态。简单过去未来式多用于主要子句中的述语动词为过去式的宾语子句。

2. 简单过去未来式由should (would) +原形动词构成。

But today she called me that she would go abroad to study soon.

但她今天给我打电话说她很快要出国留学。

She said she would go to America.

她说她将要去美国。

We wanted to know when we would start the opening ceremony.

我们想知道我们什么时候举行开幕式。

3. 表示过去未来发生的动作可用was (were) + going +不定词表示。

But you said you were going to see her next week.

但是你说下周要去见她。

He said he was going to teach us next term.

他说他下学期将教我们。 

4. was (were) +about to +原形动词表示过去即将发生的动作,一般不带时间副词。

We were about to get home, when it began to rain cats and dogs.

我们快要到家了,这时候下起了倾盆大雨。

5. was (were) to+原形动词表示在过去安排或计划好的即将发生动作,可带时间副词。

I told you yesterday that I was to see Mary.

我昨天告诉你我要去见玛丽。

She was to see him the next day.

她第二天将见他。

6. arrive, begin, come, end, go, leave, start等动词的简单过去式可表示在过去安排或计划好的未来的动作。

He said the next new school year began on September 1.

他说下一个新学年九月一日开始。

She informed me the meeting ended next Saturday.

她通知我会议将在下星期六结束。

7. arrive, begin, come, drive, fly, go, leave, start, stay等动词可用过去进行式表过去即将发生的动作。

My aunt called me that she was coming to see me.

我的姨妈给我打电话说她要来看我。

He asked her if they were leaving there.

他问她是不是他们要离开那里。