1、从过去的观点来看未来，常用在宾语从句中或间接引语中
Last week he (promise) that (come) today, but he (not arrive) yet.
(promised / would come / hasnt arrived )
2、过去将来时的其它主要形式
was / were going to
was / were about to
We were just going to ( about to ) leave when Tom fell and hurt his ankle.
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