英语必修5译林牛津版unit3第5课时
教案（语法2） grammar and usage (2) the general idea of this period in this period, the students will learn the verb -ed phrases.they can also followed by an object and/or adverbial.the students are expected to know that verb-ed phrases can be used to express the time, the reason and the condition.they will study the differences between v.-ing and v.-ed used as
