​We don't use an article

• ​With plural countable nouns and uncountable nouns with a general meaning or when we are generalising:

  Behaviour is very influenced by colour.

  People generally react unconsciously to it.

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​We don't use an article

• In certain expressions connected with places , institutions or situations:

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Did you go to university? (Were you a student?)

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What did you do in class today? (What did you learn?)

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Some text here about the topic of discussion