回答:
动名词作表语时与主语指同一件事情,相当于名词,可以和主语互换位置,意思不变; 而
现在分词作表语时相当于形容词,不能和主语互换位置。例如:
1. Her hobby is playing the violin(动名词短语). 她的爱好是弹钢琴。
= Playing the violin is her hobby.弹钢琴是她的爱好。
2. My job is looking after the children(动名词短语). 我的工作是照管这些孩子。
= Looking after the children is my job.照管这些孩子是我的工作。
3. The news is very surprising(现在分词). 这个消息很令人吃惊。
4. The film which I saw just now is very moving(现在分词). 刚才我看的电影非常动人。