【正文】 的運用，以加強對過去完成時的感性認識。 以 觀察 —— 發(fā)現(xiàn) —— 討論 —— 歸納 —— 運用為主要教學模式， 充分利用本單元語言素材 ，通過多種圖示和語法規(guī)則的呈現(xiàn) ， 讓學生比較全面系統(tǒng)地掌握過去完成時（ Past perfect tense）的用法、一般過去時（ Simple past tense）與過去完成時的用法區(qū)別及現(xiàn)在完成時（ Present perfect tense）與過去完成時的用法區(qū)別。 Step 5 The differences between the present perfect and the past perfect 1. Howard Carter is one of the most famous explorers the world has ever known. Summary: The present perfect tense is used when we are talking about a past event which relates to the present time. (PPT21) 2. Gee Gould had been to the tomb before he caught a high fever and died. Past Present Future Present Past He had bee an explorer. The 1920s Howard Carter became famous. Summary: The Past Perfect tense is used when we are discussing the past and want to talk about an even earlier event. (PPT22) [Explanation] 借用學生所熟知的語境及相關圖示，讓學生充分理解過去完成時與現(xiàn)在完成時的區(qū)別。 Step 4 Practice: the simple past tense and the past perfect tense 1. Show some pictures of another amazing person Amelia Earhart. 2. Read the notes about Amelia Earhart on page 49 and then tell us what happened to her. Let students know t