trente

In a sentence

• Le cours commence à trente heures.

  The class starts at thirty hours.

  In this sentence, 'trente' specifies the numeric value of thirty as part of a time expression.

• Il y avait trente invités à la fête.

  There were thirty guests at the party.

  Here, 'trente' expresses the exact number of guests in the context of counting.

• J'ai vécu ici pendant trente ans.

  I have lived here for thirty years.

  In this case, 'trente' indicates a quantitative duration of time.