【正文】 句子中，常用一般現(xiàn)在時(shí)代替現(xiàn)在進(jìn)行時(shí)。 es the goes the 1）過去進(jìn)行時(shí)表示過去正在進(jìn)行的動(dòng)作，而一般過去時(shí)則表示一個(gè)完整的動(dòng)作。如：They were writing letters to their friends last 。（沒有說明信是否寫完）They wrote letters to their friends last 。（表達(dá)了他們已寫好的意思，整個(gè)寫的過程已完成。）2）當(dāng)動(dòng)作延續(xù)較長時(shí)間時(shí)或表示厭煩、贊美等感情色彩時(shí)，常用過去進(jìn)行時(shí)表示。如：He was thinking more of others than of 。（表示說話者贊揚(yáng)的口氣）The boy was always making trouble ，他總是惹麻煩。（表示說話者厭煩的口氣）1）延續(xù)性動(dòng)詞和非延續(xù)性動(dòng)詞延續(xù)性動(dòng)詞指動(dòng)作可以延續(xù)一段時(shí)間，而不是瞬間結(jié)束。如：work、study、drink、eat等。非延續(xù)性動(dòng)詞指動(dòng)作極為短暫，瞬間結(jié)束。如：start、begin、hit、jump、knock等。2）在本單元中，出現(xiàn)了以when和while引導(dǎo)的時(shí)間狀語從句。when表示“當(dāng)……的時(shí)候”。從句中既可用延續(xù)性動(dòng)詞，又可用非延續(xù)性動(dòng)詞，這些動(dòng)詞既可以表示動(dòng)作，又可表示狀態(tài)。從句中的動(dòng)作既可和主句的動(dòng)作同時(shí)發(fā)生，又可在主句的動(dòng)作之前或之后發(fā)生。如：Mary was having dinner when I saw boy was still sleeping when his mother got home yesterday morning. while表示“在……的時(shí)候”、“在……期間”。它強(qiáng)調(diào)主句的動(dòng)作與從句的動(dòng)作同時(shí)發(fā)生或主句的動(dòng)作發(fā)生在從句的動(dòng)作過程中。while從句中必須是表示動(dòng)作或狀態(tài)的延續(xù)性動(dòng)詞。如：The weather was fine while we were in called while I was ，從句常用進(jìn)行時(shí)。如。While we were swimming someone stole our 39。t talk so loud while others are ： when可指時(shí)間點(diǎn)，又可指時(shí)間段，從句中可用延續(xù)性動(dòng)詞，也可用非延續(xù)性動(dòng)詞。while總是指一個(gè)時(shí)間段，從句中必須用延續(xù)性動(dòng)詞。 this unit , we39。ll learn how to tell a 39。s take section B 3a as an ）Listen to this story 聽這個(gè)故事Linda Jacobs loves her dog went to New York City last Linda was buying a newspaper at the train station , the dog got out of his box and ran station was crowded and Linda couldn39。t see Davy Linda shouted his name , some people looked at her but Davy didn39。t she called the she was talking on the telephone , Davy met another dog outside the the police were ing , Linda walked around the station and called Davy39。s didn39。t think about looking outside the , a little boy said to her , “Did you look outside ? I saw a big black dog when I came in.” When Linda finally saw Davy , he was jumping and running with another was a police officer next to police officer said to Linda , “I think my dog found your dog.”注意事項(xiàng)：、地點(diǎn)及人物。人物：Linda and her dog Davy。A police officer and his dog。A boy地點(diǎn)：at the train station時(shí)間：last SaturdayLinda loves her dog ，表明了一種持續(xù)的狀態(tài)，用一般現(xiàn)在時(shí)。They went to New York City last ，講的是發(fā)生在上周六的事情，因此，時(shí)態(tài)是一般過去時(shí)。一個(gè)故事中，時(shí)態(tài)的變化不應(yīng)太大，如果故事發(fā)生在過去，一般都用過去的某種時(shí)態(tài)。又如：When Linda finally saw Davy , he was jumping and running with another ，用過去進(jìn)行時(shí)。，如First , then , next , Finally , at the same time（與此同時(shí)）, after that（從那以后）恰當(dāng)?shù)剡\(yùn)用這些連接詞，能夠使文章流暢，通順，增色不少。Ex : P22 Section B 4aIt39。s an open ending 。注意上面提示的幾點(diǎn)注意事項(xiàng)，看圖作文，并給出結(jié)尾。：Unidentified Flying Object 不明飛行物1947年6月24日，一名叫做阿諾德的美國商人，架著一架小型飛機(jī)在華盛頓州上空，發(fā)現(xiàn)一組巨型不明飛行物以1000公里左右的速度，同他一起在空中翱翔。阿諾德的有關(guān)目擊報(bào)告第一次引起公眾的興趣，從此“飛碟”或UFO便迅速流傳開來。 boy was walking down the street when a UFO ，那個(gè)男孩正在街上走。land ，地面，降落 around ten o39。clock in the ，在早晨 in the morning在下午 in the afternoon在晚上 in the evening在十點(diǎn)鐘左右 at around ten o39。clock在正午 at noon在晚上 at night*請注意介詞的不同 off（1）脫下 take off your 39。s warm in the ，屋子里面很暖和。（2）起飛 girl was eating the icecream when the UFO took ，那個(gè)女孩正在吃冰激淋。 on the phone 通過電話談話注意：這里要用介詞on out of the shower 洗完澡出來get out of the UFO 從UFO中出來get out 出來 was walking down the street when a UFO landed right in front of ，我正在街上走。right在這里是副詞，“恰好”“正好”的意思，表示強(qiáng)調(diào)。例如right now（現(xiàn)在）right here（就在這兒）right in front of me 恰好在我前面 surprised（某人）很吃驚 was surprised when I saw ，他很吃驚。另外，surprise “讓某人吃驚” don39。t want to surprise 。 the police arrived , the alien left the ，外星人離開了商店。before“在……之前”引導(dǎo)時(shí)間狀語從句 scared（某人）給嚇壞了，害怕了 was scared when he heard the strange ，他害怕了。 away 逃跑 around the station 在車站走來走去 didn39。t think about looking outside the 。think about 考慮looking outside the station 是動(dòng)名詞短語，做think about的賓語。look outside 往外看While Hai Yan was at the doctor39。s , I was going to ，我正要去上課。at the doctor39。s 在診所（醫(yī)院）at the barber39。s 在理發(fā)店