Unit7 How long have you been collecting shells?第二課時（3a-2c）【學習目標】Talk about how long you have been doing things談論你做某事有多長時間了Present perfect progressive tense現在完成進行時【學習重難點】The different between Present perfect progressive tense and Present perfect tense現在完成進行時與現在完成時的區別【課前預習】Step Ask a pair of students to say their conversation.S1:How long has Victor been skating?S2:Hes been skating for five hours.S1:How long did Celia skate?S2:She skated for two hours.T:Very good. Thank you.Step Show the new words on the screen. Read the new words to the class and ask them to repeat.Make sure every student can understand the meanings of the new words. since conj. 自以后；自從 pair n. 一雙；一對；一副 a pair of 一雙；一對；一副Step 2aThis activity gives students practice in understanding the target language in spoken conversation.I.改正下列句子錯誤之處，每句有一處。1. He is talking for your mother. ( )2. Tom was the first one come to the classroom today. ( )3. He went shopping two days before. ( )4. Which sport do you play? ( )5. He has been learning skating for three and half years. ( )【展示交流】I.補全對話。A: Hi, Sam. What sport _?B: Skating.A:_ to skate?B: When I was five.A: So _?B: Two and a half years.A: _ every day?B: Yes, I do.A: When did you get your first pair of skates?B: _ on my birthday from my mother.【合作探究】1) Id like to collect stamps because they are interesting(1)would like to do表示“想要做某事”。Would you like to come to join my birthday party?(2)collect意為“收集，搜集”，常用作及物動詞，后跟名詞或代詞作賓語。I like collecting all kinds Of Chinese stamps very much2)Thanks for sending me the snow globe of the monster(1)thanks for相當于thank you for意為“為感謝你”，后多跟名詞短語或動名詞。Thanks for your last letter. 謝謝你的上封來信。(2)send sb. sth.=send sth. to sb. 表示“送給某人某物”He sent me a present for my birthday.He sent a present to me for my birthday我過生日他送了我一件禮物。3)By the way，whats your hobby? 順便提一下，你的個人愛好是什么?by the way在句中作插入語。介詞短語by the way意思是“且說，順便提一下，還有”，常用來介紹一般性的話題，或在腦子里突然想起的事情。By the way，have you seen her lately? 順便問一下，你近來見過她嗎?【達標拓展】Ago和before都表示以前，他們有什么區別嗎？解答：ago指從現在算起“以前”，常與一般過去時連用，before指從過去某時起“以前”，常與完成時連用。例如：It happened two days ago.I have seen you before, but I cant remember where.They have seen that TV play long before.【當堂檢測】I.單項選擇。( ) 1. I collect shells _ they are beautiful. A. when B. because C. what( ) 2. Hes been collecting shells _ he was five years old. A. for B. since C. of( ) 3. How many _ have you got? A. child B children C childs( ) 4