(1)as , like

　　as 表示"作为"强调身份，like (介词)表示"像"

　　As a teacher, he cares for these children.

　　Like a teacher, he cares for these children.

　　(2)with , in

　　with 表示"外貌特征或附带的东西" ," 用……作工具"

　　in 表示"衣着" "用某语言", 在固定搭配中也可用in

　　A man with dark glasses wanted to buy drinks.

　　A man in black wanted to buy drinks.

　　The boy is learning to write in pencil / with a pencil.

　　He retold the text in English.

　　(3)for , to

　　for表示"为了."

　　To 表示动作对象, "对, 向." 如:

　　He would do anything for his motherland.

　　Did you mention this to my father?

　　你对我父亲提起过这件事吗?

　　for 表示"就某情况而说 ", to 表示一"对某对象而言"如：

　　It's quite warm today for February.就二月的天气，今天够暖和的。

　　What he told you just now was not new to me

　　他刚才对你所说的话对我并不新鲜

　　for 表示"目的,用途"。与go, come 动词连用