Summary of Rod Ellis's Two Research Topics——Preemptive Focus on Form and Grammatical Difficulties in Second Language Learning

This paper aims to introduce two research articles of the well-known linguist in the field of second language acquisition, Rod Ellis, namely, Preemptive Focus on Form in the ESL Classroom written in 2001 and Investigating grammatical difficulty in second language learning: Implications for second language acquisition research and language testing written in 2008.