Historical clue formulations

• ___ society — 2018-04-07
• Saying "Please" and "How do you do?," say — 2010-09-20
• Gentlemanly — 2006-02-18
• Respectful — 2004-07-29
• Pleasant — 2003-10-25
• Like thank-yous — 2001-08-22
• Well-behaved — 1999-04-19
• Like Miss Manners — 1996-06-18