Research suggests that characteristics of EFL input cause morphosyntactic features to be acquired in an order dissimilar to that found in ESL contexts. To determine whether acquisition order for Korean learners could be explained by characteristics of their EFL input, a Korean elementary school curriculum was analyzed. Morphosyntactic features that were reported to be variable in a Korean EFL context, namely, the plural -"s," third person singular -"s," possessive -"'s," past regular, copula ("is"/"are"/"am"), progressive auxiliary ("is"/"are"/"am"), and phrasal verb, were examined in three steps. First, frequencies of less salient morphosyntactic features were compared to those found in native English contexts. Second, use of contraction, which may reduce the saliency of auxiliary verbs, was compared to the use of uncontracted forms. Third, phrasal verb use and the frequency of particle separation were studied. Results revealed that frequencies of the past regular, third person singular, copula, progressive auxiliary, and phrasal verb are significantly lower than those found in native English settings. Further, contractions appear to be used much more often in declarative sentences, which may lower the salience of auxiliary verbs considerably. Collectively, the results suggest that reduced frequency and salience within input have slowed the acquisition of some morphosyntactic features, which may explain why the Korean EFL acquisition order is dissimilar. [This paper was published in "TESOL Review" v2 p97-111 2010.]