.,Unit 4 Then and now,Part B read and write,.,Many years ago, I went to this school. I went to school by bike. I loved cycling. Nowadadys , many students go by bus or car. We didnt have computer games then or computers. So we often played badminton in the summer and ice-skating in the winter. We had a great time. After school, I often went to the park and read under a tree. It was so beautiful there.,1,2,3,.,Story time,.,eat raw meat,吃生肉,做饭,cook their food,help you cook,house robots,帮你做饭,家务机器人,wash the dishes,洗碗洗盘子,cook their meat,煮肉,do the dishes,洗碗洗盘子,.,many clean rivers,more and more buildings,help the earth,Dont worry!,How beautiful the world was!,.,live on the earth,住在地球上,住在大海里,live in the sea,have a bright future,heal the world,有广阔的前景,拯救世界,Make it a better place!,让它变成更好的世界！,.,eat,meet,dishes,more,humans,live,see,had,1.ate（原形）_ 2. meat(同音词)_3. dish（复数）_ 4. many（比较级）_5. human(过去式) _ 6. lived (原形)_7. sea(同音词) _ 8. have(过去式)_9. better(原级) _ 10. caveman(复数)_,P41,good,cavemen,.,I . They cooked their food.( 否定句）,2. There were many trees. (一般疑问句）,3. We should help the earth. (一般疑问句）,4. Whales lived in the sea. ( 否定句）,They didnt cook their food.,Were there many trees?,Should you help the earth?,Whales didnt live in the sea.,Try your best!,.,It was an egg. Now it is a hen.,It was raining. Now it is sunny.,Chen Jie was short. Now she is 1.5 metres tall.,.,In summer, the tree was green. Now it is yellow.,There was a building before. Now it is a park.,The cat was on the chair. Now it is under the chair.,.,3. 结构,1. 概念,2.时间,主语 + 动词的过去式 + 其它,yesterday (morning ) last (year, week, night, month) in 1990 (过去的年) two days ago the day before yesterday just now = a moment ago,now,past,future,一.一般过去时的概念,表示过去某个时间发生的动作或存在的状态,.,一. 规则动词,look looked 1）一般在动词原形末尾加 ed play played start started 2）结尾是 e 的动词只加 - d live lived hope hoped use used,3）末尾只有一个辅音字母的 重读闭音节词，先双写这 个辅音字母，再加ed,stop stopped plan planned trip tripped,4）结尾是“辅音字母+y”的词， 先变“y”为“i”再加ed,study studied carry carried,二.动词过去式的构成,.,含有 be 动词的句型,一般过去时表示过去时间内某人某物存在的状态，性质等eg: I was a teacher last year. She(He) was a singer. We You were happy. They,一般现在时表示某人某物现在的状态，性质等eg: I am a teacher now. She(He) is a singer. We They are happy. You,三. 一般现在时和一般过去时句型结构的异与同,.,不含 be 动词的句型,一般现在时用来表示习惯性，经常性发生的动作 主语动词原形其它 主语(单三)动词现在式(+s)其它 eg: 1）I go to work by bus everyday 2）you watch TV everynight. 3）we play basketball on the weekends. 4）They have lessons everymoring.,一般过去时用来表示在过去的时间里发生的动作 主语动词过去式（+ed)其它 eg: 1）I went to work by bus yesterday. 2）you watched TV last night. 3）We played basketball last weekend. 4）They had lessons two days ago.,.,1) She _ (be) our English teacher. 2) Tom and Nike _ (be)my classmates. 3) I _ (be)a student. 4) You _ (be)a lovely girl. 5) They _ (be) my parents. 6) They _ (be) farmers two years ago. 7) Mike _ (be) a baby long long ago. 8) We _ (be) at home last night.,is,are,am,are,are,were,were,was,2. 用动词的适当形式填空,.,10) He here yesterday. (be) 11) I up at 6:00 yesterday morning.(get) 12) you a good time last Sunday? (have),was,got,Did have,13) My father often to work by bus last year.(go),14) I often to pop music 3 years ago. (listen),15) He usually in the pool in 2002. (swim),went,listened,swam,16) I _(be) ill last Sunday.,17) Amy _ (sit) here yesterday.,18) _ you _(clean) your room just now.,was,sat,Did clean,.,27) He _(be) here a moment ago.,19) My sister _ (be) born on June 5. 1996.,20) _ (be) your parents at home just now?,21) He _ (study) French here last year.,22) She _ (do) homework last night.,23) They _(go) to the zoo yesterday morning.,24) We _ (have) a party last Saturday.,26) They _ (live) here two years ago.,25) Joy _ (visit) me yesterday evening.,was,Were,studied,did,went,had,visited,lived,was,