Nomen, Geschlecht und Artikeln: der, die oder das?

Nouns, gender and articles: der, die or das? Remember some basic categories for starters - 1) the suffixes "-er" and "-in" indicate masculine and feminine counterparts. 2) also, "-ung", "-heit" and "-keit", "-ik", "tät" are suffixes all indicating feminine; 3) the suffix "-ismus" signals masculine.