什么是过去将来时态及其用法

一、用法
过去将来时表示从过去某个时间看将要发生的事情.
二、构成
过去将来时由would,was/were going to,was/were to was/were about to等加动词原形构成,也可由was/were on the point of加动名词构成.
I knew you would agree.我知道你会同意的.
I said I would arrange everything.我说我来安排一切.
注：在过去将来时中,所有人称都用would,尤其在口语中.只有个别情况才用should.如：
We knew we should win.我知道我们会赢.
I told her that I was leaving soon.我告诉她我们很快就要离开.
We were to have been married last year.我们本来打算去年结婚的.
When we arrived,the train was just going to start.我们到达时,火车正要启动.
I was about to leave when the telephone rang.我正在离开,电话铃响了.
I was on the point of going when you came in.我正要出去你来了.
The talk was due to last for three days.会谈将进行三天.