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?