Recasts have been at the center of much di scussion in the field of second language acquisition (SLA) and a great deal of research has explored the effects of recasts on second language (L2) learning. However, there are st ill many issues and questions left to be answered. As a means of responding to these needs, the current study investigated the effectiveness of recasts in the accuracy development of child EFL learners in their use of past verb forms in English. The effectiveness of recasts was examined in relation to the type of past verbs (i.e., regular vs. irregular verbs) and the degree of exp licitness of recasts (i .e., implicit recasts vs. explicit recasts). Six elementary school students participated in the study and data were collected through a time-series design for 6 weeks. The analyses of the data showed that recasts were effective in enhancing the learners' accuracy in the use of both regular and irregular verbs. The learners benefited more from explicit recasts than implicit recasts in developing the accuracy of past verbs. However, improving the accuracy of regu lar verbs was more susceptible to explicit recasts than implicit recasts, while there was no significant difference in the gains of accuracy of irregular verbs in relation to the type of recasts.

I. INTRODUCTION
II. LITERATURE REVIEW
    1. Effects of Recasts in Relation to Target Linguistic Features
    2. The Degree of Explicitness of Recasts
III. METHOD
    1. Target Features
    2. Participants
    3. Feedback Treatment
    4. Procedures
    5. Measures
IV. RESULTS AND DISCUSSION
    1. The Effects of Recasts on Improving Learners' Accurate Use ofEnglish Past Tense Form
    2. The Different Effectiveness of Recasts on the Development of Regularand Irregular Verbs
    3. Differential Effects of Explicit vs. Implicit Recasts
V. CONCLUSION
REFERENCES

• Ji Hyun Kim(Dept. of English Education Keimyung University)