Hi Miri ！They have different meanings when used in different sentences. 为我 1⃣️ do sth for me；handle sth for me ex, 他为我写歌 he wrote songs for me；他为我解决了这个难题 he handled this tough issue for me. 2⃣️= 替我 ex, 为我高兴=替我高兴 feel happy for me 替我 1⃣️ substitute for me ex, 我明天有事，你能替我去值班吗？ i have other important things to do tomorrow, could you please substitute for me? 对我 1⃣️对待 treat ex, 他对我很好。he treats me well 2⃣️to me; for me ex,他对我说: he says to me .... 对我来说... as for me.. 他对我帮助很大. he helps me a lot... he is really helpful to me hope my answers can help you a little. :D

国家为我骄傲 家人替我高兴 朋友对我祝贺

为我, - Because of me, ~~而死, because of me you died. 替我 - implies proxy, ~~辦事, do things for me (you have my authority to do so) 对我 - towards me, ~~有情, has feelings for me, interested in me etc

Nelson thank you for the elaborated answer!!

为 = for 替 = 顶替 = replace 对 = 面对= face 1. do sth for me = 为我做某事 2. do the thing that is what I need to do（perhaps it's my responsibility） for someone = 替某人做某事 = the position i'm standing is replaced by you, so we call 替。 替补球员 = substitute 3. 对 = 面对 = face = versus = against。 你对我做某事 means you do sth facing/versusing/against me（for me, just to express a kind of situation that the thing is done for me because you are facing me to do） approximately = pay court to a sb. have you seen that male pay court to female in nature? such as dancing or singing to women(man often face to women). gradually the 对 got etended meaning in different areas of use. now even though you are not facing to sb actually, you are just doing sth for sb. it can also be used 对 in these situations