(1a) I usually work on Friday.
(1b) I usually work on Fridays.
(2a) I always work on Friday.
(2b) I always work on Fridays.
My non-native English speaking friends think my sentences 1a and 2b are correct because "usually" and "always" mean something happening repeatedly. So, you need the singular form of Friday.
However, I think my two other sentences are correct because I am talking about every Friday.
What is your opinion? Thanks a lot.
I would accept all of those, but I think I would naturally use 1b and 2b.
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I would accept all of those, but I think I would naturally use 1b and 2b.