用于表示过去未实现的希望和计划的句型：
(1) should like to/ would like to/ would love to have done sth.
例：You should like to have written to your mother.
你本应当给你母亲写信。
(2) was / were going to do sth.(用过去将来时态表示原打算做什么)
例：Lucy was going to watch a basketball match.
Lucy 原打算看一场篮球比赛。
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