过去进行时
1.过去进行时主要表示在过去某一时刻或某一段时间内正 在进行或持续进行的动作。 He was reading while she was setting the table. 2.与always, continually, frequently等词连用,表示过去经 常发生的动作,具有浓厚的感情色彩。 The old man was always telling that old story. 3.表示过去打算实现,但未实现的动作 I was coming, but I missed the last bus.
过去完成时
过去完成时表示过去动作发生之前已经完成的动作。只有在 与过去时间相比较时,才能使用过去完成时。 1、过去完成时+before/when/by the time+一般过去时 When we got there, the plane had already left. The plane had already left before we got there. 2.一般过去时+after/until+过去完成时 They went simming after they had finished their homework. 3.hope, plan, mean, expect, suppose, think 等动词有时用 过去完成时表示本打算做而实际没有实现的事。 I had hoped to help you, but I couldn't get there in time.
现在完成时
现在完成时由“have+过去分词”构成。 1. 现在完成时所表示的动作在说话之前已经完成,而对现 在有影响,句中没有具体的时间状语。 He has gone to Fuzhou. He has been to Fuzhou. 2.现在完成时所表示的动作开始于过去,持续到现在,也 许还会继续持续下去。常用for+一段时间,since+时间点, in the past+时间段。 He has studied English for 5 years. He has studied English since 1990. He has studied English in the past 5 ye在的特征、状态、经常性动作或真理,客观事实等 。 He goes to school every day. His home is in shanghai, but he stays in beijing at the moment.