2016-2017学年 人教版 必修三 Unit 2 Healthy eating learning about language 课件 (4)
2016-2017学年 人教版 必修三  Unit 2 Healthy eating learning about language 课件 (4)第5页

prediction, request, past habit

possibility, permission, ability…

possibility, permission, request

necessity, guessing, advice

advice, promise

necessity

Summing up