Agreement of DP-External Items. A second configuration in which the error rate is particularly high concerns DP-external modifiers. Two cases are possible: in the first, the modifier is used as nominal predicate of a noun; in the second, a past participle is used in a compound verb form. In both cases, the agreeing item is part of the predicate and not of the determiner phrase. The percentages of expected answers are particularly low here: around 45% of the predicative modifiers is correctly inflected. In the case of participles in compound verb forms, the percentage decreases to less than 30%. Therefore, these modifiers occur in the incorrect default form in the majority of cases (55% and around 70%, respectively). This sharply contrasts with DP-internal modifiers, where the error rate is below 25%. Consider first some examples of non-target-like predicative modifiers:
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Sources: Teaching Plan, Teaching Plan