1. Whats a social function of congratulating and complementing 2. Whats a stuctur of congratulating and complementing 3. What a language future of congratulatin

1. the social function of congratulating is to congratulate someone on their achievement (prestasi), meanwhile complimenting function to appreciate (menghargai) someone.

2. congratulating : Congratulation on your .....
    complimenting : What a/an [adjective] + [Noun] + [pronoun] + [tobe]
                                   example : What a beautiful girl she is!
                              How [adjective] + the + [Noun] + [tobe]
                                   example : how beautiful the girl is!