A large number of people have wondered how a language could absolutely exist without grammar. Most of them thought that people might communicate with each other by a language without grammar rules or forms. Even after communicative methodology appeared in the 1970s, researchers of grammar had indicated that the grammar should be ignored in teaching language. However, recent studies showed that grammar instruction within communicative contexts could let learners gain high proficiency level, both in accuracy and fluency. Ellis & Celce-Murcia (2002) claimed that learners should be provided authentic discourse samples of the contextually dependent grammatical rules. Florez (1999) emphasized that learners could not speak accurately and fluently without any grammar instruction. Clearly, grammar plays an important role in the progress of language acquisition. In this paper, a report on the application of some ways to teach English grammar for communicative purposes will be fully described. Moreover, the role of grammar instruction in language classroom should be discussed in this paper.