(i) for helping. (ii) happy or grateful, not both; they are the same, so one would be redundant. (iii) for help; to help means that John wants to help the kind man.
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spacedunce-5(i) for helping."Happy" and "grateful" are not the same. Check them up
(ii) happy or grateful, not both; they are the same, so one would be redundant.
(iii) for help; to help means that John wants to help the kind man.
(iv) for his help; the first option lacks a article; the second option (I guess) needs an object complement.