The past tense of try to get on the good side of is tried to get on the good side of.
The third-person singular simple present indicative form of try to get on the good side of is tries to get on the good side of.
The present participle of try to get on the good side of is trying to get on the good side of.
The past participle of try to get on the good side of is tried to get on the good side of.