初中英语语法复习——现在完成时课件（共34张PPT）

1.用法 2.基本结构 3.基本句型变化（一般疑问句，否定句，特殊疑问句） 4.关键词 用法1.过去某一时间点发生的动作对现在产生影响。 一.用法：现在完成时主要表示现在与过去的关系。 过去 现在 将来 He is full now . He has had a big breakfast. I've already read that book.我已经读过那本书。 You're too late；the train has just left.你来得太完了，火车刚开走。 表示过去动作的结果，现在仍残留着；也可不用时间状语： It has just snowed.刚刚下过雪。（地上有积雪） I have lost my watch.我把手表丢了。（现在仍未找到） The concert has started. We have to look for our seats in the dark.音乐会已经开始了，我们得在黑暗中找座位。 The president's sudden death has left the country leaderless.总统突然去世，使该国处于无领袖状态。 A: ______ your brother ______ his homework yet? (finish) B: Yes, he ‘s already done it. Key words Has finished yet already 注意：already 用于肯定句“已经”， yet 用于疑问句和否定句中“已经，尚，还”。 A: _______ you ever _______ to the park? ( be ) B: No, never. Key words Have been yet already ever never 注意： ever “曾经 ” 用于疑问句中 never “从不 ” 带有否定意义 I ______ just ________ the desk, you can take it to your classroom