课堂语言练习活动遵循准确性、得体性、流利性等原则，简述两个内涵与目的，并各举一例．说明活动方式。
(1)准确性练习使学生在练习时能够注意语法的正确与否，使其在表达上做到语法准确无误。例如在下面的口语练习中就体现了准确性原则。 S1: Is the Neon bigger than the Chevy S2: Yes, it is. Is the Lexus cheap than ... T: Cheap ... S2: Is the Lexus cheaper than the Chevy S3: No, it isn't. Is the Lexus faster than the Neon S4: Yes, it is. Is prettier the Neon ... T: Is the ... 活动方式：教师在对话的过程中不断打断学生进行语法的纠正，例如对于比较级cheap的纠正，对于Is prettier the Neon…句中缺少主语的纠正。 (2)流利性原则目的在于使学生口语流利，增强其自信心。在练习中即使出现语法错误也不会及时地去纠正．其侧重的是对语言流利性的训练。例如以下的口语练习中就体现了流利性原则。 S1: Have you ever been to Paris S2: No, I haven't. Have you S1: Yes. It's wonderful. S2: How long did you staged S1: One week. S2: The buildings are beautiful, yes S1: Yes, and the streets ... the river ... S2: Ah. Have you ever been in Rome 活动方式：教师在对话的过程中没有打断学生的对话进行纠正，例如对于肯定句、否定句的省回答，No，I haven’t．Have you 根据上下文语境省句子．and the streets…the fiver…
