Luis's notebook entry: Sep 14, 2010 SINGULAR AND PLURAL --> HAS/HAVE - DO/DOES I have some specific doubts about the Grammar and HAVE/HAS - DO/DOES SITUATION 1: a.- The table manners has not changed so much obs: incorrect, because "table manners" is plural and If I wanted to ask for it, it would be "Who have not changed much?", and the answer could be: The table manners or THEY and "THEY" is used with "HAVE" c.- The table manners doesn't has changed so much obs: incorrect, because the auxiliars verbs DO/DOES are used only in "simple present" and "has changed" is a compound form d.- The table manners doesn't changed so much obs: incorrect, because the auxiliars verbs DO/DOES are used only in "simple present" b.- The table manners have not changed so much obs: correct !!!, is a compound form and plural and the answer to the question "Who have not changed much?" is THEY or the table manners, and "THEY" is used with "HAVE" SITUATION 2: a.- The custom has not changed so much b.- The customs have not changed so much When the subject "The Custom" is singular, I use "HAS", and when is plural I use "HAVE"; the reason for this is because if I want to know "What have not changed much?", the answer for a) could be: The Custom (IT) or THE CUSTOM (THEY) and with IT i must use HAS , and with THEY i must use HAVE.....that's right? SITUATION 3: a.- The custom does not change so much b.- The customs do not change so much In this case, I'm talking in simple present, so when the phrase is singular i have to use DOES and DO in the other case (plural).....WHY ?????????????????