second language learners are often in a state of learning, writing, and re-writing grammar rules in their minds. This is referred to as Interlanguage (IL) – the state of a learner's mind at any specific level of development while acquiring another language. Learners will often re-write their declarative knowledge as they learn. Learners will also proceduralize errors, which can be difficult to untrain depending on the students proficiency in the L2 and their motivation to improve in the L2.