at

Use 'at' to introduce a subordinate clause after verbs of knowing, saying, thinking, or believing.

Jeg tror at det er sant. (I believe that it is true.)

'At' introduces a subordinate clause where the word order is typically V2 (verb in second position) in the main clause, but in the subordinate clause, the verb often comes after the subject and adverbs.

Hun vet at han ikke kommer. (She knows that he is not coming.)

When a subordinate clause introduced by 'at' begins a sentence, the main clause will have inverted word order (verb-subject).

At han er syk, visste jeg ikke. (That he is sick, I did not know.)

'At' can often be omitted in informal speech, similar to 'that' in English, but it's generally good practice to include it in written Norwegian, especially in formal contexts.

Jeg håper du kommer. (I hope you come.) - informal, vs. Jeg håper at du kommer. (I hope that you come.) - formal

Avoid using 'at' when the subordinate clause is an infinitive construction. Instead, use 'å' (to).

Feil: Jeg liker at lese bøker. (Incorrect: I like that read books.) Riktig: Jeg liker å lese bøker. (Correct: I like to read books.)