on Mondays

[ratóncolorao]

On Monday evening - that particular day in the evening; but if I want to refer to a habit I do every Monday evening, how do I say it? On Mondays evening... ?

I Thank you in advance.

[euncu]

On Mondays evening... ?

on monday evenings...

[ratóncolorao]

on monday evenings...

Thank you, very kind.
I always doubt about it. I never know if I have to make plural Saturdays or afternoons.... Neither of them sounds right to me, so I'm afraid I will ask the same question a thousand times.

[euncu]

also, for the days of the week;

on Sundays, etc., like; What do you do on Sundays?

[ratóncolorao]

also, for the days of the week;

on Sundays, etc., like; What do you do on Sundays?

I have not problem with that expression so far. The problem comes when I put together the day of the week and the part of the day. Thank you for your kindness, anyway.
Cheers