Position 0 is not part of the sentence and can only contain sentential connectors (such as conjunctions or interjections). Position 1 can contain any sentence constituent. Position 2 can only contain the main verb. Position 3 is the subject position, unless the subject is fronted to occur in position 1. Position 4 can only contain light adverbs and the negation. Position 5 is for non-finite verbs, such as auxiliaries. Position 6 is the position of direct and indirect objects, and position 7 is for heavy adverbial constituents.