THE DEFINITE ARTICLE The definite article is 'the'. You probably know that we use it when both the speaker and listener know what is being talked about. What you might not know is that in another use it means the same as the adverb 'enough'. Dan has more in his 90 second explanation. For an exercise: http://www.bbc.co.uk/learningenglish/english/course/upper-intermediate/unit-11/session-1 | BBC Learning English