讲授人:Eva.Zhu Tales of unexplained M1U2 grammar and usage Let's enjoy Have you ever heard about this film? Have you seen this film before? 1.Some students have already seen this film . 2.Some students have never heard about this film before. 3.The film hasn't been seen by some students yet. structure : 主动形式:have/has past participle（过去分词） 被动形式:have/has been past participle present perfect tense（现在完成时态） observing carefully When do we use present perfect tense ? Are you ready? Let's go! Thinking o
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必修二 Unit 1 Tale...
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