英语必修2译林牛津版u3精品
教案8（语法） period eight grammar and usage (ii) ⅰ.teaching aim: compare the use of the past tense, the present perfect tense and the past perfect tense. ⅱ.teaching important point: when do we use the past tense, the present perfect tense and the past perfect tense? ⅲ.teaching difficult point: how to use the past tense, the present perfect tense an
