【教学过程一】选修8 Unit 5 Meeting your ancestors Period 3（新课标人教A）
【教学过程一】
Teaching procedures & ways教学过程与方法
Step I. Revision
Check the students’ homework and let one read their work.
Step II. Lead-in
Ask the Ss to point out the sentences that contain the structure as “We have been excavating here for many years” in the text.
Step III. Explanation
一、结构形式
现在完成进行时是由“助动词have(has) + been+动词的现在分词”构成。
二、基本用法
1. 表示从过去某时开始一直延续到说话时还在进行，或可能还要继续下去的动作。它通常和“for+段时间”或“since+点时间(也可以是从句)”的时间状语连用。例如：
I have been waiting for a letter from my parents. 我一直在等我父母的来信。
It has been raining for three hours. 雨已经下了三个小时了。
We have been studying here since 2004.
自从2004年以来，我们一直在这里学习。
