as in the impersonal form example here: Neg. CL can-I. walk the grass "You cannot walk on the grass." Zagona also notes that, generally, oblique phrases do not allow for a double clitic, yet some verbs of motion are formed with double clitics: María CL go away-3.sg "Maria went away." Imperatives in Spanish do not require the use of clitics, but when they are used, a specific word order must be followed. With an affirmative verb, the clitic succeeds the verb. However, in a negative command, word order alters in that the clitic precedes the verb. Another review of sentence positions of in various grammatical constructions offers the following example, demonstrating imperative differences thus: open-2.sg.CL(Acc.) "Open it." Neg CL(Acc.) open-2.sg. "Don't open it." With continuous verbs, the clitic can precede the auxiliary verb, as in the example below: (correct) John CL(Acc.) was prepare-ing * (incorrect) The clitic can also be placed after the participle, as in the following example: (correct) Maria already CL(Acc.) have-3.sg. prepare-pastpart * (incorrect) The second phrase in each example above includes the clitic in this particular grammatical configuration as an attachment to the verb which is marked as ungrammatical. Specific issues arise in clitic use and syntactic representation in terms of animacy. The Spanish language does not explicitly demonstrate in its grammar whether an object, either direct or indirect, refers to an animate or inanimate object. Therefore, the use of two clitics is common, although not always required. In this way, clitics can be doubled or "redundant" when two instances occur within the same phrase. Double clitics are found in instances of phrases with both direct accusative case objects and indirect dative objects in this way: CL(Dat.) CL(Acc.) tell-1.sg.pst yesterday "I told you yesterday." Regarding clitic doubling in Spanish, Ordóñez has suggested a "cluster" versus "split" formation, weighing consideration of the double clitic as a single unit (cluster) or a separable unit (split). The syntactic approach maintains a left-dislocation for the clitics while sustaining a separation from the verb. In the cluster model, both clitics are two adjacent constituents whereas the split model, one clitic has been split from the other, appearing higher on the syntactic tree. Both are still under the same c-command of the left branch but are no longer sisters to each other. Ordóñez suggests that when clitics are sisters, they may not even be considered constituents in the syntax. The hypothesis includes