Danish basic constituent order in simple sentences with both a subject and an object is Subject–Verb–Object. However, Danish is also a V2 language, which means that the verb must always be the second constituent of the sentence. Following the Danish grammarian Paul Diderichsen Danish grammar tends to be analyzed as consisting of slots or fields, and in which certain types of sentence material can be moved to the pre-verbal (or "grounding") field to achieve different pragmatic effects. Usually the sentence material occupying the preverbal slot has to be pragmatically marked, usually either new information or topics. There is no rule that subjects must occur in the preverbal slot, but since subject and topic often coincide, they often do. Therefore, whenever any sentence material that is not the subject occurs in the preverbal position the subject is demoted to postverbal position and the sentence order becomes VSO.