Questions & Answers about Jeg forstår ikke hvorfor toget er sent.
In Norwegian main clauses the negation ikke normally follows the finite verb. The basic word order is Subject (S) – Finite Verb (V) – Negation (ikke) – Object/Complement. So
• Jeg (S)
• forstår (V)
• ikke (negator)
• hvorfor toget er sent (object clause)
Putting ikke elsewhere (e.g. at the very end) is possible for emphasis but sounds marked.
Because this is an indirect question (a subordinate clause), not a direct question. In subordinate clauses Norwegian uses normal SVO order. Only direct questions use V2 word order.
• Indirect: … ikke hvorfor toget er sent (SVO)
• Direct: Hvorfor er toget sent? (V2)