and Agreement Underespecification Hypothesis (TAUH) for the same language; and Lee et al. (2008), and Faroqi-Shah & Dickey (2009) introduced a morphosemantic hypothesis, arguing that the diacritic tense features are affected in English agrammatism. Bastiaanse (2008) did not find such dissociation for Dutch but rather that reference to the past is more impaired regardless of verb inflection or agreement. Her research found that finite verbs are more difficult than non-finite verbs, but both within the finite verbs and within the nonfinite verbs, the forms referring to the past (third person singular past tense and participle respectively) are more difficult than their counterparts referring to the present (third person singular present tense and infinitives). None of the hypotheses on verb forms aforementioned (TPH, TUH, and TAUH) can account for these results, ever since participles in Dutch are not inflected for tense and agreement nor do they check their features in the left periphery. Similar findings have been also reported for Greek and for English respectively in a re-analysis of Nanousi et al.'s (2006) and Lee et al.'s (2008) data, and also for Turkish in Yarbay, Duman & Bastiaanse (2009). In any case, the conclusion of Bastiaanse (2008) was that an additional hypothesis expressing that agrammatic speakers have difficulty making reference to the past was needed. In that same paper she unveiled two possible answers: (a) it could be that representations of events in the past are semantically more complex, possibly because there are two time periods of relevance. (b) It might also be the case that it is not so much reference to the past as such that is difficult for agrammatic speakers, but to express this reference by verb inflection. See also Lists of language disorders Notes Neurological disorders Speech and language pathology Language disorders Communication disorders