010．If it is necessary for sb to do 是否有

If it is necessary for us to know how to use the new technology
我们是否有必要知道怎么用新技术

If it is necessary for him to come the class on time
他是否有必要按时来上课

If it is necessary for the students to learn some classical literature.
学生是否有必要学学习古典文学

If it is necessary for him to know the bad news
他是否有必要知道这个坏消息。

If it is necessary for the children to learn how to protect themselves
孩子是否有必要学会如何保护自己