natural disasters一 預習作業(yè)及預習交流a. 檢查學生預習單詞情況(個別讀且糾正集體讀)b.預習作業(yè)交流(小組核對集體校對質(zhì)疑交流)用所給動詞的正確形式填空：1. look! some children _ (chat). 2. sorry, i _ (help) the baby tie the shoelace at present. 3. some children _ (chat) this time yesterday. 4. sorry, i _ (help) the baby tie the shoelace at that time. 5. i _ (wash) my face at 6 this morning. 6. she _still _ (lie) in bed this time yesterday. 7. _you _ (watch) tv from seven to nine yesterday evening. 8. -where did you go just now? -to the teachers office. -what were you doing there? -i _ (solve) a math problem with my teacher. it took us a long time to work it out. 9. people_ (run) wildly while pieces of glass and bricks _ ( fall ) down.二 交流展示及點撥提高） a. 當兩個延續(xù)（思考舉例）的動作同時發(fā)生，兩個句子都可用過去進行時來表示，用while連接，如：1. people _ (run) wildly while pieces of glass and bricks _ (fall) down. 2. yesterday afternoon, while daniel _ _ (work) on the computer, millie _ (stand) beside him.3we _ _ (clap) our hands while the performers _ (march) across the park.b. 當一個延續(xù)的動作正在發(fā)生的時候，另外一個瞬間動作發(fā)生了，可用“when”或“while”連接，較長的動詞用過去進行時，較短動詞用一般過去時1. hello kitty _ (wave) to the visitors while she _ (dance) to the music. 2. we _ (read) a terrible story when suddenly the lights _ (go) out. 3. the doorbell _ (ring) while we _ (talk) on the phone yesterday. c. 一般過去時與過去進行時用法的比較: 一般過去時表示在過去某個時間發(fā)生的動作或存在的狀態(tài)，而過去進行時則表示在過去某一時刻或某一段時間正在進行的動作。如： 1. mary _ a letter to her friend last night. mary昨晚給她的朋友寫了封信。（信寫完了 。） 2. mary _ a letter to her friend last night. mary昨晚一直在給她的朋友寫信。（信不一定寫完。）三 檢測反饋a. 用when/ while 填空 1. _simon arrived, amy was reading. 2. i was reading english _ the teacher came in. 3. _my mother was cooking, the phone rang. 4. mrs. wang was listening to music _ her husband was reading newspapers.b. 用所給動詞的正確形式填空1. millie _(look) for a video about earthquakes when simon _ (see) her in the library yesterday. 2. when i got home last night, mum _ (watch) tv. 3. what _ you _ (do) at 9:00 p.m. last night?c. 翻譯1. 下雪時，我們常常堆雪人。2. 我們到達公園時，一些人在拍照。3. 王飛今天像往常一樣到校很早4. 當時我們在踢球，她們在做游戲。參考答案（學案）一b 1 are chatting 2 am helping 3 were chatting 4 was helping 5 was washing 6 was; lying 7 were; watching 8 was solving 9.were running, were falling二a 1 were running; were falling 2 was working; was standing 3 were clapping; were marching b 1 waved; was dancing 2 were reading; went 3 rang; were talkingc 1 wrote 2 was writing三a 1 when 2 when 3 while 4 whileb 1 was looking; saw 2 was watching 3 were doingc 1. when it snows, we often make snowmen.2. when we arrived at the park, s