be动词原型的用法?到底什么时候用这个原型啊,比如说：life is the most valuable for a man,and everyboby wants to be safe.这里为什么要加个be.还比方说：it is good to be safe at home on a night like this.这里为什么也要加个be 呢
问题描述：
be动词原型的用法?
到底什么时候用这个原型啊,比如说：life is the most valuable for a man,and everyboby wants to be safe.这里为什么要加个be.
还比方说：it is good to be safe at home on a night like this.这里为什么也要加个be 呢
答
want to do sth. It is good to do sth. 不定式后面要跟动词原形,be动词的原形是be,所以用be.