注意：
1. "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。
例如：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。)
2. "was/were about to do"表示说话的瞬间就会发生的动作。
例如：I felt something terrible was about to happen.(我觉得有可怕的事要发生了。)
3. was/were on the point of doing
例如：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。)
4. "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。
例如：I was about to start when it suddenly began to rain.(我正要动身天突然下雨了。)
5. 过去将来时常可用来表示过去习惯性的动作。此时，不管什么人称，一律用would。
例如：This door wouldn't open.(这扇门老是打不开。 )
