I love the smell of coffee. 我喜欢咖啡的香味。 (1) 主语改为 she —> She loves the smell of coffee. (2) 主语改为 he，再改为疑问句  —> Does he love the smell of coffee? (3) 主语改为 you，并改为附加疑问句 —> You love the smell of coffee, don't you? My face looks awful. 我的脸好难看。 (1) 改为疑问句 —> Does my face look awful? (2) 主语改为 their faces —> Their faces look awful. (3) 改为附加疑问句 —> My face looks awful, doesn't it?