Grammar is a foundation of language, as all languages consist of rules and usage. Learning English grammar is challenging for Thai EFL learners because of the contrastive grammatical features between Thai and English. Learning English grammar is even more difficult for Thai deaf and hard-of-hearing students since they have limited tools and cues for acquiring English grammar. This paper discusses possible challenges in teaching English grammar to deaf and hard-of-hearing students and reviews some teaching methodologies that might be effective for deaf and hard-of-hearing Thai EFL students. The authors also introduce the WebQuest instruction as a promising alternative instruction of English grammar for this group of students.