The men drink water.In German for men we use "the" as der , but in this statement used "die" for men
I wan to know the explanation for this change
it is true that there are two cases which do not use die in the plurals. but if you are building plurals just as an exercise without taking the cases into account you will always use die for all the plurals. like
der Hund- die Hunde
der Baum- die Bäume
der Raum- die Räume
das Messer- die Messer
das Kissen- die Kissen
das Glas - die Gläser
die Decke- die Decken
die Gabel- die Gabeln
die Maus- die Mäuse
When I learn nouns I learn the gender and plural like:
m, Hund, Hunde
n, Messer, Messer
f, Decke, Decken
I feel it is best not to get used to thinking about the nominative article so much because you will need to think about what article to use when constructing a sentence. Many times you will say "den Hund", "mit den Messern", etc.
German distinguish 3 genders that a word can have and English only has one and therefore the translation to "the" changes.
Here an example for all 3 genders with the articles. It's always indefinite singular - definite singular - indefinite plural - definite plural
Masculine ein Apfel - der Apfel - Äpfel - die Äpfel (an apple - the apple - apples - the apples)
Feminine eine Kuh - die Kuh - Kühe - die Kühe (a cow - the cow - cows - the cows)
Neuter ein Buch - das Buch - Bücher - die Bücher (a book - the book - books - the books)
Then there are different cases (like dative, accusative) where the translation changes again. I recommend you to check out the tips¬es and the link that EL5tEL posted above.