This study examines the effects of corpus-based collaborative learning on the intake of grammar rules among high school students. This study is grounded on three theoretical backgrounds: Grammar teaching based on a large amount of input enhances intake; peer interaction promotes learners’ participation and has positive effects on their academic achievement; and discovery instruction stimulates learners’ motivation and helps them notice rules, leading to the conversion of input into intake. The subjects were divided into two groups, each group consisting of 60 students. The subjects studied six grammar rules over a period of six weeks. Group 1 did small group activities with the materials extracted from the COBUILD corpus, while Group 2 was given the teacher’s explanation of each rule with some examples designed to show how the target rule works. After each grammar lesson, both groups took a post-test. The results indicate that (a) corpus-based grammar learning helps engage learners in the learning process and raise their grammar awareness, (b) corpus-based learning facilitates noticing and identifying the target form better than its meaning and (c) peer interactions in a small group have positive effects on the intake of grammar rules.