There are several words that follow the same declension as the definite articles ‘der’, ‘die’, ‘das’ :
dies- = this
jen- = that
jed- = each/every (NOTE: the plural of ‘jed-‘ is ‘alle’ (all), and follows plural declension)
manch- = many/some
solch- = such a
welch- = which
The endings of these ‘der-Wörter’ are listed below (with the definite articles in parentheses next to them):
As can be seen, the endings of the ‘der-Wörter’ follow the pattern of definite articles and their endings. Here are a few examples of the ‘der-Words’ in sentences:
Jede Person muss dieses Formular ausfüllen. / Every person has to fill out this form.
Diese Wohnung ist sehr schön. / This apartment is very nice.
Manche Kinder können nicht schwimmen. / Some children cannot swim.
Welches Buch hast du da? / Which book do you have there?
Solche Probleme gibt es immer beim Reparieren. / There are always such problems when doing repairs.
Welchen Kuchen möchten Sie denn? Diesen oder jenen? / Which cake would you like then? This one or that one?