This study investigates the sentence processing in English with Korean EFL learners who have limited language exposure compared to the environment of the first language acquisition and the second language learning. The goals are to explore whether EFL learners show the same NP attachment preference as native speakers of English have shown and whether the syntactic priming effect will occur with EFL learners. Two experiments were conducted to answer the two research questions. The results showed that EFL learners preferred HA for relative clause(RC) attachment, contrary to the results in the previous studies with native speakers of English. Also, syntactic priming effects were observed in RC attachment: robust effect in HA and weak effect in LA.