1. The man who came this morning  is our class teacher . = coming this morning .

2. Can you tell me the accdient that happened yesterday ? = the happened accdient.

3. Those who have finished their work can go home now.= Those finished their work. 

4. Is there anyone who can answer this question ? = anyone answered this question.

网友写的等于号后面的部分，全部是错误的。所有句子只能保持原样（用定语从句），不能改为分词，更不能是过去分词（如句2），句3的错误更是不可饶恕。句4 把情态动词can 删去，改为过去时，是为哪般？如此篡改句意，语法对了，句意与原来不符，同样错误！