过去将来时的构成是什么?

过去将来时的基本特征,也就是我么年今天所谈到的“立足过去,着眼未来”。它表示从过去某一时间来看将要发生的某个动作或存在的某种状态。例如:Mary told me that she would go to Shanghai by plane.那么过去将来时态的构成是什么呢?它都有哪些用法呢?

基本构成——

A ) would + 动词原形

如He asked me if I would stay here. 他问我是否要待在这儿。

B ) was / were going to + 动词原形

如No one knew when he was going to finish his homework.

C ) was/ were ( about ) to + 动词原形

如:He said that they were to leave at six.

She said that the meeting was about to begin.

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