六年级下册英语作业课件-Unit 4 Road safety 语法课堂译林版(共13张PPT)

1、Unit 4 语法课堂1.must、mustnt的用法【重点释疑】must是情态动词,后面直接加动词原形。表示“必须”。如：You must go home now. 你现在必须回家了。表示坚定的建议。如：You must go to see the doctor. 你必须去看医生。表示推测,暗含有很大的可能性,用于肯定句。如：It must be rainy tomorrow. 明天肯定要下雨。虽然must表示“必须”的意思,但是用于否定句时,mustnt却表示“不要、不能、禁止”的意思,而不是“不必”。如：You mustnt run on the road. 你不能在路上跑。一般疑问句的

2、结构为： Must+主语+动词原形+其他? 肯定回答为：Yes, must. 否定回答可用：No, neednt.如：Must I finish my homework today? 我今天必须完成家庭作业吗？Yes, you must. 是的,你必须要完成。/No, you neednt. 不,你不必完成。Must they clean the classroom now? 他们现在必须打扫教室吗？Yes, they must. 是的,他们必须打扫。/No, they neednt. 不,他们不必。( ) 【易错示例】Must I finish my homework today? Tomo

3、rrow is Saturday.A. Yes, you must.B. No, you neednt.C. No, you mustnt.【易错示例】What do you know about the road (safe)?B2.safe、safety、safely的用法【重点释疑】（1）safe是形容词,意为“安全的”。如： The food is safe for babies. 这食品对婴儿来说是安全的。（2）safety是名词,意为“安全”。如： For your safety, please do not get off until the train stops.为了你的安全

4、,请在火车停稳后下车。（3）safely是副词,意为“安全地”。如： How can you cross them safely? 你怎么样才能安全地穿过它们呢？road safety是固定搭配,意为“道路安全”。因此这里应该填safety。一、选择方框中的词并用其正确形式填空。（可重复使用）must mustnt neednt cant 1. In the library, you _ keep quiet.must 2. _ you see the sign over there? Dont swim in the river.Im sorry.Cant 3. Must I go home

5、 now?No, you _ . You can play football here for an hour.neednt 4. What must we not do on the road?We_ play football on the road.mustnt 5. I want to be a good student. I_ listen carefully in class.must 6. Can I park my car in front of the library?No, you _ .cant 4. Must Nancy_(wash) clothes now?二、用所给

6、词的适当形式填空。 1. You mustnt_(run) on the road.run 2. We must stay _ (safe) on the road and cross it_ (safe).safesafely 3. We should pay attention to (注意) medicine _ (safe).safetywash 5. In many big_ (city), many people like eating wild animals.cities 6. It brings us many problems. But we _ (should) be a

7、fraid of it.shouldnt三、按要求完成句子。 1. Must Mike go to see the doctor? (作肯定回答)Yes, _ _ .hemust 2. The children must play football on the road. (改为否定句)The children _ _ football on the road.mustntplay 3. We must look at the traffic lights first. (对画线部分提问) _ _you_ first?Whatmustdo 4. An old woman is crossing the road. (对画线部分提问) _is_the road?Whocrossing 5. You cant watch TV now because its late. (对画线部分提问)