1、过去将来时的五种表达形式一、was/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。二、was/were + 动词-ing 形式Nobody knew whether the guests were coming.没人知道客人们是否要来。三、was/were + 动词不定式.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
2、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） 四、was/were about to do“was/were about
3、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。五、was/were on the point of doingIm glad you have come. I was on the point of calling you, but youve 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，
4、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六、特定场合的一般过去时可表示过去将来时条件状语从句和时间状语从句中须用一般过去时代替过去将来时。例 1：I didnt know when she would come, but when she came I would let you know.例 2：I didnt know if she would come, but if she came I would let you know.3) 在含有 be about to
5、do 的句子中，不能再加时间状语。如：Wrong: The medical team is about to start immediately. Right: The medical team is about to start. 医疗队就要出发了。七）be to do: (1)表示事先商定、安排或准备要做的事情。如：The students are to meet at the school gate tomorrow. 2）表示可能性，必要、责任、义务、禁止等。如：Her necklace was not to(couldnt)be found. 她的项链找不到了。2) be going
6、 to do: 1) 表示将要发生的事情或打算最近要进行的动作。如：It is going to rain soon. 快要下雨了。2) 在含有条件状语从句的主从复合句中，主句一般不用 be going to，而常用 will（第一人称用 shall） 。如：The football match will be put off if it rains tomorrow. 3) be about to do: 1) 表示即将发生的动作，在时间上指最近的将来。如：We are about to start. 我们就要出发了。2) 在含有 be about to do 的句子中，不能再加时间状语。如：Wrong: The medical team is about to start immediately. Right: The medical team is about to start. 医疗队就要出发了。
