Abstract
Recent developments in cognitive and psycholinguistic research postulate that language learning is essentially the learning of grammatical construc-tions. An important type of grammatical construction with wide-ranging pedagogical implications is grammar patterns as laid out in Pattern Gram-mar. While grammar patterns have seen increasing adoption in language pedagogy, existing applications typically follow a paper-based, teacher-centered approach to instruction, which is known to be less effective in grammar learning than blended, learner-centered approaches. 
 In this paper, we propose a blended learning model that integrates web-based technology with classroom-based instruction to facilitate efficient, personalized grammar learning. We present the design and implementation of a blended grammar learning system that provides customizable learning materials for individual learners by discovering important grammar patterns from corpora in an unsupervised manner. Preliminary evaluation shows that the proposed system achieves an accuracy in pattern discovery comparable to systems that rely on manually precompiled pattern lists and hard-coded rules. With a flexible architecture and an easy-to-use interface, the system can play a key role in the creation of a blended learning environment that can be integrated into a wide range of language learning curricula.
Highlights
Recent developments in cognitive and psycholinguistic theories have established grammatical constructions, or learned pairings of form and meaning, as the central components of language learning [1]
We propose in this paper a blended grammar learning system featuring unsupervised pattern discovery from corpora
In the remainder of the paper, we describe the process of developing the system using a web-based architecture, evaluate the accuracy of grammar pattern discovery, and discuss ways to integrate the system into a blended grammar learning curriculum
Summary
Recent developments in cognitive and psycholinguistic theories have established grammatical constructions, or learned pairings of form and meaning, as the central components of language learning [1]. Grammatical constructions can be manifested in different forms structurally, and one structural representation scheme that has seen increasing pedagogical applications in recent years is grammar patterns. Infinitive, and can represent examples such as ask somebody to do something. This representation scheme presents a transparent and flexible description of structural patterning in natural language, rendering it suited to language teaching [4]. Grammar patterns are ideal for form-focused instruction, where conscious and focused attention to target structures has been found to result in substantial and durable target-oriented gains compared with implicit instruction, especially for second language learners [1]. Existing pedagogical applications of pattern grammar include development of thesaurus-like resources containing teachable constructions and deriving materials for language teaching [5]
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