大致分析如下：the most important thing为主语；to remember about social customs为不定式做后置定语，修饰句子主语thing；is为系动词；后面的not to do anything that might make other people feel uncomfortable-----especially if they are your guests.都是表语。该表语中，do后面的宾语anything被后面的定语从句that might make other people feel uncomfortable修饰；especially if they are you...
