教学ppt课件 外研版高中英语必修4《Module 2 Traffic Jam》ppt课件.ppt

1) be型（Dont＋be＋表语） Dont be lazy! Never be late again. 2) do型（Don‘t＋行为动词原形＋其它） Dont throw the ball like that. Dont worry. Ill soon be all right. Never do it like that. Don’t anybody say a word. 2.祈使句的否定形式 3) let型有两种否定形式： 1) Let＋宾语＋not＋动词原形＋其它。 Let him not go there. Lets not waste time. 2) Don‘t＋let＋宾语＋动词原形＋其它。 Dont let her go there. Dont let the water run into the  room. 4) No+ v-ing/n. 表示禁止做某事 No parking/smoking/admission! 3. 祈使句的类型 1). 不带主语的祈使句 Be careful next time! Come and see me whenever it is convenient to you. 2). 带主语的祈使句； 为了加强语气或指明同谁说话，可在动词前加上主语。加上主语时，由于是面对面说话并直呼其名，故不论第几人称，动词均用原形，不考虑主谓一致问题。 Nobody move！ Mary come here —everybody else stay where you are. You put on more clothes. It’s cold outside. 3). (条件)祈使句+and/ or+ (结果)简单句 此句型为“条件与结果”并存的句式，其中的祈使句可转化为if条件句。 1. Work hard and you will succeed. If you work hard, you will succeed. Working hard, you will succeed. 2. Hurry up, or you will miss the last bus. If you don’t hurry up, you will miss the last bus. 4).祈使句+附加信息；附加信息常表示发出祈使动作的原因 Put on your coat, please—it’s very cold outside. Turn down the TV set—the baby is asleep in the room. 5).祈使句的附加疑问句 Open the door, _________________? Don’t forget, _________________? Let’s go there at once, __________? Let us go there, ______________? will you?/won’t you will you shall we will you 6).祈使句的强调形式 为了表示强调或加强命令、劝告的语气，使句子更具有说服力，常在其谓语动词前加上do。 Do put the direct object after the verb. Do tell me where to buy the tickets for the concert. Do be careful next time! Homework: Write a similar passage about your town. Module Two Traffic Jam Now match some of the words with their definitions. bike boat coach helicopter motorbike taxi trolleybus truck underground bus 1. It’s a bus used for long distance.  2. It’s got two wheels and it’s fast. coach motorbike 3. This bus is connected to the electric wires. 4. You must pay to use this car. 5. It’s slow, cheap and has two wheels.