Ik moet het formulier invullen.

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Breakdown of Ik moet het formulier invullen.

• moeten: must
• het formulier: the form
• invullen: to fill in

Questions & Answers about Ik moet het formulier invullen.

Why is invullen at the end of the sentence?

In Dutch main clauses with a modal verb (here moet), the infinitive of the main verb goes to the very end. The pattern is:
• Subject – finite verb (modal) – objects/adverbials – infinite verb.
So Ik moet (I must) … het formulier invullen (fill in the form).

Why is the article het used before formulier?

Dutch has two definite articles: de and het. You use het with neuter singular nouns. Formulier is a neuter noun, so it takes het. If it were a common‐gender noun (like stoel, “chair”), you’d say de stoel.

Why doesn’t the separable verb invullen split into vul … in here?

Normally, in a simple main clause without a modal you would split:
“Ik vul het formulier in.”
But when you add a modal (moet), the full infinitive (prefix + verb) stays together at the end:
“Ik moet het formulier invullen.”

What’s the rule for placing het formulier before invullen?