Demonstrative pronouns must agree with the noun they modify in gender, number, and case. To choose the correct demonstrative, determine the gender, number, and case of the noun and find the matching demonstrative on reference charts. The charts show the singular and plural forms of hic, haec, hoc and ille, illa, illud and their translations, with endings that follow typical declension patterns. Examples demonstrate using the right demonstrative based on agreement with the modified noun.