This document discusses using textual enhancement to improve grammar learning. Textual enhancement involves manipulating text, such as underlining, bolding, or italics, to make grammatical forms more noticeable. The goal is to draw learners' attention to linguistic patterns without explicit instruction. The document provides background on the difference between input (what learners are exposed to) and intake (what is processed in the mind). It also discusses theories that noticing and understanding grammatical rules is important for second language acquisition. Textual enhancement is presented as an implicit, external method of input enhancement aimed at helping learners notice grammatical patterns in context.