牛津深圳版英語八下unit 5《save the endangered animals》（period 3）(文件)
【正文】 conversation and answer the question Talk time Modal verbs like “should” and “must”. We can ask people for obligations like this: What should/must I/you/he/she/we/they do about the dirty river? What ought to do about the dirty river? We can talk about obligations like this: I/You/He/She/We/They should/must/oug
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