2016-2017学年 人教版 选修6 unit5 The power of nature grammar 课件 (3)
2016-2017学年 人教版 选修6 unit5 The power of nature   grammar 课件 (3)第2页

Period 4 grammar

Review the usage of –ing form. Examine the sentences beloew and discuss in what way the structures similar to each other and in what way they are different