All aunts are female. Whatever is blue is colored. There are either fewer than 20 students in the room or there are more than 10. It is false that some triangle has exactly four sides. Clearly, whatever is necessarily true is actually true.
Necessary truth is a sufficient condition for actual truth.
And equivalently, Actual truth is a necessary condition for necessary truth. In short, Necessary truth is a sufficient condition for actual truth. And Actual truth is a sufficient condition for possible truth.