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The field of language teaching and learning has been in a constant state of motion over the last few decades. The push to integrate computer-assisted language learning (CALL) in the curriculum is something experienced by many teachers at different levels of instruction. There have been many researches on the effectiveness of CALL on SLA (e.g. Egbert, 1999; Jonassen, 1999; Kenning & Kenning, 1990; Pennington, 1996; Warschauer, 2000; etc.). However, questions remain unanswered regarding the effect that such technology will have on both the communicative instructional style of the teacher and on the learning process of the students. This thesis aims to investigate the effects of CALL on teaching and learning process in this transitional phase in China.In the study, both quantitative and qualitative methods are applied. The results are based on classroom observation, questionnaire and in-depth interviews with students. The major findings of the study can be summarized as follows: On teacher’s part, their main functions have changed greatly. They are more like an organizer or a guide rather than just a knowledge-provider. And they use many activities in the class to stimulate learners’ participation and practice their communicative skills. On learner’s part, they are shifting from a passive role into an active one.Their awareness and ability of self-access learning should be raised. The functions teachers perform have such a great influence on learners that their roles are more influential in a CALL environment today.The thesis finally reveals some pedagogical implications, points out some limitations of this study and gives some ideas for further study.