Worksheet has 3 sections. 1 - fill in the blank with the correct form of the definite article. 2 - fill in the blank with the correct form of the indefinite article. 3 - rewrite the article and noun, changing singular to plural and plural to singular. The vocabulary on this worksheet corresponds to Descubre 1 Lección 1, but it may be used with any text. Easy to edit to match your book.