Hi,
I found that a noun "routine" can be used with an article and without.
1. So many days are routine and uninteresting, especially in winter.
2. The job will be easier once you settle into a routine.
Any explanations?
1. Routine is an adjective that describes a day.
2. Routine is the a noun which means the order and way you regularly do things.
Val
Leigh answer is 100% correct and 100% complete.
"Routine" can be an uncountable noun too, in a more abstract sense. See here (inc. 3rd example sentence).
https://www.collinsdictionary.com/dictionary/english/routine
Thanks Leigh, Richard and Chris.
I see my misunderstanding first example, but what about this:
1. I love occasionally to aberrate from routine.