老师：Hello everyone. Today we'll learn Unit 5, discovering useful structures. In this class, you will identify and understand the meanings and functions of some model verbs. Could, can, may, might, or two, wood, mask and etc. Express modality and talk about future events in the past. Read the following sentences, focus on the model verbs and try to find the different meanings of each group of sentences.
老师：In Group A, we can find the exam may be difficult, refers to possibility. While the exam is difficult is a fact. In Group B, you should be studying harder is advice. While you are studying harder is a fact. In Group C, I can study all night during the semester, means possibility. Well, I study all night during the semester, as a fact.
老师：Now, can you find the functions of model verbs? Summary one. The function of model verbs is to express modality. Modality means people's feeling and attitude. What modality can be expressed with modern verbs? Read the following sentences and try to choose what the model verbs express. Since we have finished the book, we can discuss it now. Expresses possibilities. You must do it at once, for the headline is due. Express obligation means Fusion Eve, would you please pass me the salt? Express request. You needn't have stayed. Express necessity. You ought to help him. Express advice. I would rather do it myself. Express intention. Summary two. Now, have you known what modality can be expressed with mother verbs? Model verbs can be used to express necessity, possibility, obligation, request, advice, and intention. Then how do you know the model verbs express modality? Analyze what the model verbs express. Oh, you must be Sylvia's husband. Since we have finished our homework, we can discuss it now. It could rain tomorrow. It may seem lucky to you, but not to me. That might not be true. All the 5 sentences show possibility. So we can find model verbs used to express possibility are must, can, could, may, and might. You must come at once. We have to wear uniforms at school. I ought to be on my way. All the three sentences show necessity or obligation, so we can find model verbs used to express necessity or application are masked. Have to O2, another group. Will you please take her to the library? Could you offer me work here? Can I ask a question? May we ask what you are doing in this country? Would you please pass me the salt? Or the five sentences can be used to show requests, so we can find model verbs used to express requests are will, could, can, may, and would.
老师：You could ask the teacher for help. You should write him a letter. The cookies Susa made are delicious. You ought to try some. You'd better serve him quick and get him up quick. You can do your homework now.
老师：All the 5 sentences show advice so w
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