period 3 grammar (ellipsis and a review of the past participle) learning aims:1. to have a general knowledge of ellipsis be able to tell which part of the sentence is left out. 2. to review the usage of the past participle. important point and difficult point: to be able to tell which part of the sentence is left out. 预习案previewing case 使用说明及学法指导：1. 自我学习课本p90的内容，完成预习案。 2. 完成时间20分钟。 task1定义：为了使语言简洁或避免重复，省略句子的一个或几个句子成分，这种语法现象称为______________。 finish exercise 2.3.4 on p37 in the textbook. task 2 choose the best answers. 1)----tomorrow is a holiday. why are you doing your homework?
