语 境 自 主 领 悟
先观察原句
后自主感悟
①I haven't seen Justin since.
②Detective Sam Peterson，who has taken charge of the case，told journalists，‘Sometimes people make up such amazing stories...’
③From our recent survey of students，we have found that 53 per cent of the students often play sports.
④For centuries，people have reported seeing a wild creature in the Himalayas called Yeti.
⑤Large tracks have also been discovered which some people say belong to the Wild Man.
⑥This incident has received great interest due to reports of strange lights in the sky and of alien visits around the time the boy disappeared.
⑦I've been writing the composition for two hours，but I haven't finished it yet.
⑧I have been wanting to meet you for a long time.
1.句①～⑥中均运用了现在完成时，其谓语动词的构成形式为：have/has＋过去分词。
2.句⑦⑧运用了现在完成进行时，其谓语动词的构成形式为：have/has＋been＋现在分词，表示过去发生的动作一直持续到现在。
3.现在完成时有两个基本用法：一是表示过去发生的动作对现在造成的影响或结果，如句②③⑤⑥；二是表示过去开始的动作一直持续到现在，并且有可能继续下去，如句①④。
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