activity and activities

[Thngoc]

Please tell me when "activity" is a count noun and non -count noun, and give me some examples to make it clear.
Many thanks.

[Mister Micawber]

It works just like other nouns that can be in either form:

(n-uncount) Activity is a situation in which a lot of things are happening. 'Other boats came and went in a flurry of activity'.

(n-count) An activity is something that you spend time doing. '...outdoor activities.'

(n-plural) The activities of a group are the things they do to achieve their aims. '...terrorist activities.'
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Native English teacher at Mister Micawber's

[Thngoc]

Thank you so much