(
课件网) UNIT 6 Electricity everywhere Grammar Learning objectives Understand the meaning, characteristics and usage of modal verbs. Summarize and explore a variety of sentence patterns of modal verbs to improve the logic and criticality of thinking. Cooperate with others actively to complete learning tasks together. 01 02 03 Free talk What can electricity do It can light the house What can electricity do It can work the traffic lights Modal verbs ①Definition：Modal verbs can be used to talk about ability,permission,obligation,etc. Daisy is teling her brother Benny about her science lesson. Read their dialogue and pay attention to the words in bold.and then try to answer the following questions. (1)What is the form of the verbs after modal verbs？ (2)what does the modal verbs mean in each sentences？ (3)Can we change can into could，must into could？ Presentation What’s the modal verbs and its usage？ Must：obligation 表义务 Benny: How was your school day,Daisy Daisy: It was great.We learnt about electricity in our science class. Benny:Can you tell me what you know about electricity Daisy: We can't see it powering everyday things but we can see it when there is a lightning storm. Benny: Right.Mum told me we mustn't go out doors during a storm,It's dangerous. Daisy: Yes,that's right.However,you can produce electricity safely by rubbing a ruler against your sweater.Look at me! Benny: Wow.That's fun! May I try Daisy: Yes,of course.But you must give it back to me because it's my favourite ruler! Can：ability表能力 May：permission 表请求 Presentation Think: 1.what does the modal verbs mean in each sentences？ After modal verbs such as can,may and must,we use the base form of a verb. We use can and cannot(can't)to say we are able or unable to do something. We use may and may not to ask for,give and refuse permission.In less formal situations,some people like to use can and cannot (can't)for the same purpose. We use must and must not (mustn 't)to tell people what to do or what not to do. Let's sum up the rules! · · · Presentation Benny: How was your school day,Daisy Daisy: It was great.We learnt about electricity in our science class. Benny:Can you tell me what you know about electricity Daisy: We can't see it powering everyday things but we can see it when there is a lightning storm. Benny: Right.Mum told me we mustn't go out doors during a storm,It's dangerous. Daisy: Yes,that's right.However,you can produce electricity safely by rubbing a ruler against your sweater.Look at me! Benny: Wow.That's fun! May I try Daisy: Yes,of course.But you must give it back to me because it's my favourite ruler! Presentation Think: 2.What is the form of the verbs after modal verbs？ see go produce try give base form 1.We can't see it powering everyday things but we can see it when there is a lightning storm. 2.Mum told me we mustn't go out doors during a storm,It's dangerous. 3.You can produce electricity saf ... ...
