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How long have you been like this?
你这样多久了？
II．语法全解
延续性动词表示能够延续的动作,如：learn, work, stand, lie, know, walk, keep, have, wait, watch, sing, read, sleep, live, stay等。延续性动词可以与表示时间段的状语连用。
How long have you …? 你做某事多久了？
I have …for two days / since two days ago.
二、课堂活动
Teaching Procedure:
Step 1: lead in 呈现句型，询问别人的情况
Step 2:review 复习重点短语
Step 3:presentation
since 和 for 呈现，让学生理解这两个的用法，并对比二者的差异
Step 4: role play 角色扮演，熟悉日常生活情景对话，把本单元所学知识用英语流利表达
Step 5：总结本节课重难点
Step 6 ：通过做练习题巩固本单元语法
Exercises:
?1. When he arrived at the bus stop, the bus _______ for 20 minutes.
A. has left B. had left C. has been away D. had been away
2. I ______ the League for 5 years so far.
A. joined B. have joined C. have been in
3. The factory ________ since the February of 1988.
A . has been open B. has opened C. was open D. opened
4. Mary and Rose _______friends since they met in 2000.
A. have made B. have been C. made D. have become
5.Miss Gao ______ this school for nearly 5 years.??
? A. has been in? B. has come to? C. has taught
6.Ben ______ a teacher for 4 years .??
A. has been? B. has become? C. was D. became
7. I ______ home for a week.?
A. have returned?? B. have been back?? C. returned