高中英语讲座:be+动词-ing
【What are you doing? I am working.】
What are you doing?I am working.你在干什么?我在工作。这是一个现在进行时的句型,表示现在正在进行着某种事情,其构成形式是助动词be+动词-ing.动词-ing是动词的分词形式,动词be要根据主语人称进行变化,例如:
The little boy is cleaning the classroom.
小男孩正在打扫教室。
They are eating eggs.
他们正在吃鸡蛋。
They are writing on the blackboard.
他们在黑板上写字。
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