1．过去将来时的用法
(1)过去将来时常用于间接引语或宾语从句中，当主句谓语动词用过去时态时。
He said he would go to the north for the holiday. 他说他将去北方去度假。
They wanted to know when you would finish the article. 他们想知道什么时候你会完成这篇文章。
2．过去将来时的构成
(1)基本表达方式：would＋do
Mother promised that she would take me to Beijing the next year.
妈妈许诺明年带我去北京。
(2)表示过去将来时的其他几种表达方式：
①was/were going to do，表示准备、计划做。
She said she was going to buy a new bike.
她说她打算买一辆新自行车。
②was/were about to do，表示即将发生的动作，不和表示时间段的状语连用。
The bus was about to start.
公共汽车马上就要开了。
③was/were to do，表示过去曾计划或安排要做。
The press conference was to be held next week.
记者招待会将于下周举行。
④was/were doing仅限于某些表示位移的动词，如：come，go，arrive，leave等。表示按计划或安排将要发生的事。
I didn't know when they were coming again.
我不知道他们什么时候再来。
