[观察例句]
观察下列句中黑体部分的语法作用
1．She was quite astonished at his rudeness.
动词ed形式作表语
2．He was excited at the news.
动词ed形式作表语
3．It's astonishing that she should say that sort of thing to you.动词ing形式作表语
4．This film is more exciting than any that I've ever seen.
动词ing形式作表语
[归纳用法]
一、动词ing形式作表语
主要用来说明主语的特征，含有“令人……”之意。
The news he told us is exciting.
他告诉我们的那个消息是令人激动的。
Seen from the student's viewpoint，the oral exam can be frightening.
从学生的角度来看，口试是令人害怕的。
