Because the moon takes 29.5 days to orbit the Earth, February never has a blue moon because it never has more than 29 days.
(the moon; takes; 29.5 days; to orbit the Earth) (February; never has; a blue moon; because it never has more than 29 days) (it; never has; more than 29 days)
the moon February it
takes never has never has
29.5 days to orbit the Earth
a blue moon because it never has more than 29 days
more than 29 days