构成
　　一般过去将来时是由"should/would + 动词原形"构成的。
　　He asked me yesterday when I should leave for Paris.
　　昨天他问我什么时候动身去巴黎。
　　They wanted to know how they would finish the homework earlier.
　　他们想知道怎样才能早一点儿完成家庭作业。

用法
　　一般过去将来时的出发点是过去，即从过去某一时刻看以后要发生的动作或状态。
　　①一般过去将来时常用于间接引语中
　　He said they would arrange a party.
　　他说他们将安排一个晚会。
　　I asked if he would come and fix my TV set.
　　我问他是否来帮我修电视机。

　　②一般过去将来时可用来表示非真实的动作或状态
　　If I had a chance to study abroad, I would study at Cambridge University.
　　如果我有机会出国学习的话，我就会去剑桥大学。
　　I wish he would go with me to the cinema tonight.
　　今晚他能和我一起去看电影就好了。

过去将来时间其他表达法
　　①was/were going to + 动词原形
　　He said that he was going to live in the country when he retired.
　　他说他退休后要住在农村。
　　They thought it was going to rain.
　　他们认为天要下雨了。
　　②was/were + 动词-ing形式
　　Nobody knew whether the guests were coming.
　　没人知道客人们是否要来。
　　I was told that the train was leaving in a few minutes.
　　我被告知火车几分钟后就要开了。
　　③was/were + 动词不定式
　　She said she was to clean the classroom after school.
　　她说她放学后要打扫教室。
 
　　It was reported that another bridge was to be built across the Yangtse River.
　　据报道长江上将要再建一座大桥。

注意：
　　"was/were going to + 动词原形"或"was/were +动词不定式完成式"可表示未能实现的过去将来时间的动作。
　　Last Sunday we were going to visit the Great Wall, but it rained.
　　上星期天我们本想去游览长城的，但却下雨了。（没有去成）
　　I was to have helped with the performance, but I got flu the day before.
　　我是打算帮忙演出的，但前天我感冒了。（没有帮上忙）

　　④was/were about to do
　　"was/were about to do"表示说话的瞬间就会发生的动作。
　　I felt something terrible was about to happen.
　　我觉得有可怕的事要发生了。
　　⑤was/were on the point of doing
　　I'm glad you have come. I was on the point of calling you, but you've saved me the trouble now.
　　很高兴你来了。我正准备给你打电话，现在你省去我这个麻烦了。

提示：
　　"be about to do" 和 "be on the point of doing"结构一般不与表示将来的时间状语连用，但后面可以接when引导的分句。
　　I was about to start when it suddenly began to rain.
　　我正要动身天突然下雨了。