Other Examples:

Day; en dag - dagen - mange dage (-e) - alle dagene (-ne)

Week; en uge - ugen - mange uger (-r) - alle ugerne (-ne)

Month; en måned - måneden - mange måneder (-er) - alle månederne (-ne)

Year; et år - året - mange år (nothing) - årene (-ene)

Change of Vocals:

Father; en far - mange fædre

Mother; en mor - mange mødre

Brother; en bror - mange brødre

Daughter; en datter - mange døtre

Man; en mand - mange mænd

Child; et barn - mange børn

Eye; et øje - mange øjne

Tooth; en tand - mange tænder

Hand; en hånd - mange hænder

Toe; en tå - mange tæer

Foot; en fod - mange fødder

Night; en nat - mange nætter

Book; en bog - mange bøger

Adjectives & Nouns:

I would like to add this one too, as the previous rules act differently when an adjective is added in front of the noun. The adjective is always placed between the article and the noun! Please also note that the adjective gets bent too. Here is an example;

In indefinite singular; ‘en glad hund’ - ‘a happy dog’

In definite singular; ‘den glade hund’ - ‘the happy dog’

In indefinite plural; ‘glade hunde’ - ‘happy dogs’

In definite plural; ‘de glade hunde’ - ‘the happy dogs’

Plurals:

The Danish plurals are not easier than the singulars - in fact, they are even more difficult. Most nouns bent in indefinite plural get ‘-e’/’-r’/’-er’ added, just like the English ‘-s’. But again, there no rules you can follow. However, to help figure out the right ending, Danish children learn to say ‘flere’ (more) or ‘mange’ (many).

Here are the previous examples: ‘flere mus’ (more mice) ‘flere huse’ (more houses) ‘flere ænder’ (more ducks) ‘flere ankre’ (more anchors). Did anyone notice something special? Let me point them out for you;

‘Huse’ is a typical example of most nouns, only having added ‘-e’. But what about ‘mus’? Like the English ‘sheep’, no article gets added here (funny fact: the Danish word for ‘sheep’, ‘får’, also does not get an article).

Let’s move on to ‘ænder’ - there is the typical ending, ‘-er’, but what happened to the ‘a’? Some vocals, especially ‘a’, get changed into another vocal in plural. Like the ‘sheep’ rule, this is not so typical, but does occur from time to time, and is somewhat similar to the English ‘mice’.

And finally we have ‘ankre’, where the typical ‘-er’ has switch place within itself, as the word ‘anker’ ends on ‘-er’. However, this is far from usual, as most words ending on ‘-er’ either gets added the typical ‘-e’/’-er’.

The article for definite plurals is usually ‘-ne’/’-ene’ that gets added behind the indefinite article. Here are the examples: ‘musene’, ‘husene’, ‘ænderne’, ‘ankrene’.  In school, children add ‘alle’ (all) to figure out the article, just like with ‘flere’/’mange’.

And to those who think ‘HOW ON EARTH ARE DANES ABLE TO FIGURE THIS OUT ON A DAILY BASIS??’

Well, you pointed it out yourself - because Danes are raised with Danish and speak it every day, we are used to all these ‘rules’ and can often hear what’s right or wrong. However, sometimes even we have to find the dictionary to make sure. All languages are difficult, one way or another~

NOTE:

Some nouns are either only singular or plural, and cannot be bent as the regular ones. Examples of this;

‘Slik’ (candy) / ‘et stykke slik’ (a piece of candy) ‘slikket’ (the candy) - never ‘slikkene’, as this means ‘the licks’ in Danish, something completely different. ‘Slikket’ can also mean ‘the lick’.

‘Bukser’ (pants) / ‘et par bukser’ (a pair of pants) ‘bukserne’ (the pants) - here, the example is quite similar to the English translation and does not need further explanation, I hope.