现在完成时 1.构成 have/has + 过去分词(done) 通常使用现在完成时的几种情况 (1)表示过去发生的某一动作对现在造成的结果或影响。
The disappearence of Justin has made Kelly very unhappy. (2) 表示动作从过去开始,持续到现在。 Justin has lived in Dover since he was born. (3)表示动作的确切时间不明确或不重要
The boy has already come home. (4) 表示刚结束的动作
The police have just finished searching Justin’s home. (5) 表示反复发生的动作
Some villagers say that they have seen UFOs many times. 常与现在完成时连用的时间状语 (1). 情况 (1)(3)(4)
already, yet, ever, just, recently, lately, never, before(adv.) ①The boy has already/just got home. ②I haven’t heard from him
yet/recently/lately. ③I have seen the old man somewhere before. (2). 情况 (2) since/for I have lived in Beijing since 2000.
since I arrived here.
for 5 years. (3). 情况 (5) times, recently, lately Some villagers say that they have seen UFOs many times/recently/lately. 现在完成进行时 1.构成 have/has + been + 现在分词(doing)
通常使用现在完成进行时的几种情况 (1) 表示过去开始的动作一直延续到现在并仍在继续之中
She has been talking to me since she saw me. (2) 表示过去开始的动作刚结束并在某种情况下与现在有关联
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