Warlpiri verbs are always argument-taking predicates and Warlpiri nominals are always arguments or argument-taking predicates. This is shown in the tree structure to the right of "ngaju-rna mijipurru" (""I am short"") in Warlpiri, with the nominals "ngaju" (""I"") and "mijipurru" (""short"") acting as either an argument-taking predicate or argument, depending on the category of the AUX "-rna" (""am""). In this sentence, the AUX is first person singular, indicating that "ngaju" must act as an argument and that "mijipurru" must act as an argument-taking predicate in order for the sentence to be grammatical in Warlpiri. In English, the DP ""I"" is the argument and the adjective ""short"" is the argument-taking predicate. The trees to the right show the differences between configurational and non-configurational languages, with an example tree from Warlpiri compared with an example tree from English.