In English, we often use words like "so" or "that" to refer back to an idea we just mentioned, such as saying "I think so" instead of repeating the whole thought. Danish handles this by using the pronoun det.
Substituting a Clause with "det"
When a verb expects an object, but the object is an entire situation or statement, we substitute that statement with det to avoid repeating it.
When det is pulled to the front of the clause to link directly back to the previous sentence, it triggers the V2 rule. This means the verb must immediately follow det, placing the subject after the verb.
| He says that he can repair the car, but I cannot guarantee that. | Han siger at han kan reparere bilen, men det kan jeg ikke garantere. |
| The storm is coming soon, and I actually fear that. | Stormen kommer snart, og det frygter jeg faktisk. |
| He says that he is telling the truth, but she rejects that. | Han siger at han fortæller sandheden, men det afviser hun. |
Answering Questions
This structure is especially common when answering questions or agreeing and disagreeing with a statement. Where English might just say "Yes, I will" or "I don't think so," Danish typically leads with det, followed by the verb and subject.
| Will you help me tomorrow? Yes, naturally I will. | Vil du hjælpe mig i morgen? Ja, det vil jeg naturligvis. |
| He is apparently very sick, but I do not believe that. | Han er tilsyneladende meget syg, men det tror jeg ikke. |
Expressing Contrast
To strongly disagree with an assumption, use the adverb tværtimod (on the contrary). You can also soften a negative response with nødvendigvis (necessarily).
| I am not tired. On the contrary, I am completely ready. | Jeg er ikke træt. Tværtimod er jeg helt klar. |
| Do you think that he is angry? No, I do not necessarily think so. | Tror du at han er sur? Nej, det tror jeg ikke nødvendigvis. |
Using "det" with Prepositions
If a verb or adjective phrase is normally followed by a preposition—such as overbevist om (convinced of)—you still substitute the main idea with det at the front of the sentence. The preposition is simply left behind at the end of the clause.
| I am convinced that there is no risk. | Jeg er overbevist om at der ikke er nogen risiko. |
| She claims that she will win the match, and I am convinced of that. | Hun påstår at hun vinder kampen, og det er jeg overbevist om. |