Futher definite article lessons

Hi Inma, this is one of the most difficult things for me to grasp, especially in the body of a sentence, please could you put this near the top of your list for new lessons?

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JohnB2Kwiziq Q&A regular contributorIncluding the definite article

Hola,

Is there a lesson which develops this theme, and discusses when the definite article is used with the noun in the body of a sentence - and if there are times when this is not the case?

Thanks. John"