Het boek heeft achttien pagina's.

Because boek is a het-word in Dutch. Singular nouns take either de or het, and you have to learn which article goes with each noun.

• het boek = the book
• plural: de boeken = the books

A useful thing to remember:

• singular: het boek
• plural: de boeken

So even though boek is a het-word in the singular, its plural still uses de.

Heeft is the third-person singular form of the verb hebben (to have).

The subject is het boek, which is singular, so Dutch uses:

• ik heb = I have
• jij hebt / heb jij
• hij/zij/het heeft = he/she/it has

So:

• Het boek heeft achttien pagina's.
• literally: The book has eighteen pages.

Just like in English, Dutch uses to have to talk about how many pages something contains.

In a normal Dutch main clause, the finite verb usually comes in second position. This is a very important Dutch word-order rule.

Here:

1. Het boek = first element
2. heeft = verb in second position
3. achttien pagina's = the rest

So the pattern is:

• Subject + finite verb + rest

This is the standard word order for simple statements in Dutch.

Achttien means eighteen.

It is made up historically from:

• acht = eight
• tien = ten

But in modern Dutch, you should just learn achttien as the normal word for 18.

A few nearby numbers:

• zeventien = 17
• achttien = 18
• negentien = 19

Unlike adjectives, numbers like achttien do not change form here.

This is a very common question. The apostrophe is used in some Dutch plurals to keep the pronunciation clear.

The singular is:

• pagina

The plural is:

• pagina's

Dutch often uses an apostrophe before -s with words ending in certain vowels, especially unstressed -a, -o, -u, -y, to avoid confusion or an unwanted pronunciation change.

Compare:

• auto → auto's
• oma → oma's
• pagina → pagina's

So the apostrophe here is a spelling rule, not a possessive marker like English 's.

Pagina is a de-word.

So:

• de pagina = the page
• de pagina's = the pages

In this sentence, though, there is no article before pagina's, because it is part of a quantity expression:

• achttien pagina's = eighteen pages

That is why you do not see de here.

Because after a number, Dutch normally uses the noun directly, without de or het.

So you say:

• een pagina = one page
• twee pagina's = two pages
• achttien pagina's = eighteen pages

This works much like English:

• eighteen pages, not the eighteen pages unless you specifically mean a particular set of pages.

In this sentence, achttien pagina's simply tells you the quantity.

Yes, that is also possible.

• Het boek heeft achttien pagina's. = The book has eighteen pages.
• Het boek is achttien pagina's lang. = The book is eighteen pages long.

Both are natural, but they are structured differently:

1. heeft version

   • focuses on possession/containment
   • literally the book has eighteen pages

2. lang version

   • uses lang (long) to describe length/extent
   • literally the book is eighteen pages long

The sentence you were given is the most straightforward way to state the page count.

Heeft is pronounced roughly like hayft.

A few helpful points:

• ei sounds a bit like the English vowel in day, but it is not exactly the same.
• The f is clearly pronounced.
• The final t may be softer or less strongly released in normal speech, but it is still part of the word.

Dutch learners often notice that final consonants can sound less strong than in careful spelling pronunciation, but you should still learn the full form heeft.

Achttien can be tricky for English speakers because of the ch sound.

Roughly:

• acht has the Dutch ch, a throaty sound not found in standard English
• tien sounds approximately like teen

So achttien is roughly:

• akh-teen

Important note: The ch is not like English ch in chair. It is the same sound you hear in words like:

• gracht
• nacht
• acht

This is one of the most noticeable pronunciation features of Dutch.

Here, het means the.

That is because it is being used as the definite article before boek:

• het boek = the book

Dutch het can also mean it in other contexts, for example:

• Het is groot. = It is big.

So het has more than one function in Dutch. In your sentence, it is definitely the article, not the pronoun.

Yes. In informal spoken Dutch, het is often reduced to 't.

So:

• Het boek may sound like 't boek

This is very common in speech, but in normal writing you usually write het in a full sentence like this:

• Het boek heeft achttien pagina's.

So as a learner:

• recognize 't when listening
• write het unless you have a specific reason to use the shortened form

Because Dutch does not capitalize all nouns.

So:

• het boek
• de pagina
• achttien pagina's

Only the first word of the sentence is capitalized here:

• Het

This is more like English than German.