Use the plural form Fridays to talk about every Friday or "Fridays" in general.
When talking about every Friday or "Fridays" in general, we typically use the plural form (Fridays).
On Fridays, many people look forward to the start of the weekend.
Alternatively, you can use the singular form (Friday) in similar situations. For example, if you are asked:"Would you like to come to my pool party on Friday?" You can answer the following:
I usually visit my mother on Friday/Fridays.
Both options, the singular and the plural form, are correct in the example above. The sentence contains an adverb of frequency ("usually") and a verb in the simple present. Other common adverbs of frequency that you can use are: frequently, generally, normally, often, always, seldom, rarely, etc.
Henry always skips breakfast on Fridays/Friday.
When using Fridays at the beginning of a sentence and talking about every Friday, we recommend the plural to avoid ambiguity:
On Fridays, my friends and I often gather for a casual dinner.
When talking about a specific day, use the singular form (Friday).
On Friday, my colleagues and I gathered in the conference room.
James met up with old friends on Friday.
James met up with old friends on Fridays.
Follow the same rule with the rest of the days of the week: