约1040字。

　　Unit 10 Jobs and Chores学案
　　一. 教学内容：
　　    Unit 10 part 2
　　  1. 现在完成时里already, yet 的用法
　　  2. 现在完成时延续性动词及非延续性动词的使用
　　3. 重点词组
　　二. 具体内容：
　　I. yet和already都是副词，意思是“已经”.常与现在完成时连用。
　　Already 用于肯定句。
　　e.g. I have already finished my homework.
　　    I have already done it twice.
　　yet 常用于否定句和疑问句中，通常放在句尾。
　　e.g. I haven’t finished my homework yet.
　　    The meeting will be held in half an hour, but they haven’t got everything ready yet.
　　II. 现在完成时应注意的几点。
　　1. 现在完成时句中常见的时间状语
　　A. 表示从过去一直持续到现在，不能是具体的过去时间
　　for + 表示一段时间的词语
　　since + 表示过去时间点的词语
　　since +表示过去的时间状语从句
　　eg. I have been a teacher ______  a year.
　　He has been at this school _______ 1992.
　　We have learned 1,000 English words _______ we came to this school.
　　B. just, already, yet, before/ ever, never
　　有此类副词时，常强调动作完成，不强调动作的持续.
　　eg. Have you _____been to Japan?
　　I have _____ finished my homework.
　　I have       finished my homework .
　　I haven’t finished my homework ____. 
　　2. 区分短暂性动词与持续性动词.
　　表示短暂性(瞬间性)的动词在现在完成时的句中不能和一段时间连用.即for, since短语或how long问句
　　e.g. I have bought this pen for 2 months.
　　I have had this pen for 2 months.
　　How long have your      this pen?
　　The play has begun for an hour.
　　The play has been on for an hour.
　　come/arrive-be                go out –be out         leave-be away/from