Grammar and usage: Present perfect continuous tense
?内容分析：
本板块围绕单元话题，首先通过一位佩戴机械手的残疾女孩的自述，要求学生在语篇中观察现在完成进行时的基本构成，并自主探究、归纳现在完成进行时的一般规则；随后通过句子、语篇两个层面的练习巩固所学，让学生深化理解现在完成进行时的含义和用法；最后组织学生运用所学，以角色扮演的方式运用目标语法进行采访对话，使语法知识的运用和话题相结合，实现“形式—意义—使用”三者的统一。
?教学目标：
By the end of this section, students will be able to:
1. identify the verb form of the present perfect continuous tense;
2. work out the general rules of the present perfect continuous tense;
3. use the right tenses to finish related tasks;
4. apply the present perfect continuous tense in new contexts.
?教学重难点：
1.To apply the rules correctly and properly;
2.Develop the thinking ability by analyzing and summarizing the grammar rules.
