Good sentence
1)I have done the same things for the past 40 years.
ex) I have studied English for six years.

2)I should teach it, they should learn it, case closed(The aforementioned decision, outcome, resolution, or situation is final, with no ambiguity or room for variation or amendment.)
ex) He has finished his work by himself, case closed.

3)Well, your year is going to be long and arduous(involving a lot of strength and effort), dear(used to show that you are surprised, upset, or annoyed because something bad has happened).
ex)Well, your task is going to be arduous because no one tried that before.