I think, using "on" to talk about day is better. such as on sunday morning, etc. Yet, I still don't understand about letter 's' behind the word evening.
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future332Or should I say on Tuesday evenings?Yes. I can squeeze this class in on Tuesday evenings.
AnonymousI still don't understand about letter 's' behind the word evening.You have to attend the class every Tuesday evening. That's more than one evening. It's many evenings.