主讲人：张满胜
主讲人：张满胜
本次课内容
讲解“序言”中III、IV两页：
2. 结构形式与意义用法
例句：
I have been coming to Beijing for 14 years.
以及讲解下面5个句子的异同点：
a. I’m here for two hours.
b. I’ve come here for two hours.
c. I came here for two hours.
d. I’ve been here for two hours.
e. I’ve been coming here for two years.
