Thank you for your hard work vs. Thank you for your hard work

(1)When should I use it
(2)Thank you for your efforts.
(3)Thank you for your hard work
(4)the condition of going through difficult and difficult times
(5)or that kind of work or life
(6)hard work or difficulty
(7)Thank you for your hard work and thank you for your hard work
(8)Both are said to be inappropriate expressions for superiors
(9)Thank you instead Thank you. Thank you for your effort
(10)Thank you for your hard work It should be used instead as an expression
(11)Happy JooE ITHUN
(12)-Source National Institute of Korean Language Standard Korean Dictionary