像 He is the first person finishing the test. 这里为什么用finishing
At the beginning of class,the noise of desks being opened and closed outside the classroom.
这里为什么用being opened
Tom received a letter just now saying his father would come to see him soon
这里为什么用saying
这几句话,从哪里能看出来是正在做的事情?我觉得更像被动啊
追答ing是动词的现在分词,表示某人正在做的事情
这几句话从哪里可以看出来时正在做啊,我只看出被动。