Are all of these correct?
- I wash my car on Mondays.
- I always wash my car on Monday.
- I always wash my car on Mondays.
I know #1 is correct, and it means every Monday. However, I'm not sure if #2 is correct. If we use the adverb "always," is it necessary to put the "s" at the end of "Monday"? I think for #3 the use of "always" adds emphasis to the fact that it is every Monday.