结构：have/has+V.(过去分词)
用法：表示过去发生或已经完成的某一动作对现在造成的影响或结果。 时间状语：ever, never, just , already, yet,before eg. I have never seen the film. They have just finished the work. The boy hasn’t cleaned his room yet.上一篇： 小学一年级英语语法：关于介词
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