下列教学片段选自某一高中课堂实录，阅读后回答问题：? (1)该片段反映了教学中哪两个环节?(10分) (2)分析这两个教学环节的目的。(10分) (3)从教学有效性的角度评价这个教学片段(至少写两个要点)。(10分) T: Could you play games on Internet every evening, boys and girls? Ss: Sorry, I couldn't. T: On what day could you play them every week? Ss: Only on Saturday and Sunday. T: Oh!We could say you could play games twice a week. I could go visit friends on Monday and Tuesday evenings. So we could say I could visit my friends twice a week. What does TWICE here mean? Ss: It means "两次". T: Great! Then you will be divided into groups, four in one group, to make as many sentences as possible by "Could you ... every week?" and "twice a week". After 5 minutes, I'll invite one speaker out of each group to present in class.