高一英语北师大版必修1课件unit3grammar.ppt

Unit 3 grammar;Point out the verb, the subject and the object in the following sentences:;When do we use the passive voice?;The plan was supported by those who wished to have more chances to speak English.;被动语态的几种时态;In pairs, change the following sentences into the Passive. Pay attention to the tense.;2. They are moving people out of he houses.;4. They have put out the forest fire.;6. They were decorating the house when the accident happened.;1. have to 2. don’t have to 3. can 4. can’t 5. ought to 6. ought not to ;Must ;;must 与 have to 的区别;I missed the last bus, so I had to walk back home. (客观上必须这样做，不得不做） We must do exercise every day to keep fit. (主观上要这样做） 翻译：我们不得不早早起床,要不就会迟到。 We have to get up early every day, or we will be late for school. ;don’t have to 不必 mustn’t 禁止 You don’t have to go to the meeting. 你没必要参加这个会议。 You mustn’t tell him my secret. 你一定不能把我的秘密告诉他。 ;should VS ought to 应该(advisable) should更常用，一般情况下可通用。 翻译（肯定）地板每天都要清扫。 The floor ought to / should be cleaned every day. （否定）你不应该总是玩电脑。;can vs can’t;Show time;被动语态的几种时态;;;情态动词+ have + done;;;;Look at the first sentence in each group and complete the second sentence with the correct verb forms.;Look at the given sentences and work out the correct verb forms of the other sentences.;2. The theatre is being built in the centre of the city. The money ______________ (collect) for the disabled. 3. The girl was being operated on in the hospital. The house ________________ (paint) white when I was there.;Put the verbs in brackets into the Passive. Use the Present Simple or Past Simple tense.;During this festival, water (2) _________ (splash) everywhere to wash away the old and welcome the new. Buckets of water (3) __________ (carry) around the streets and people attack each other by splashing anyone and everyone. ;Tourists (4) ________ (tell) that they are welcome to join in but they cannot splash citizens, small children and police on