题目内容
12．有必要给学生们上一堂安全方面的课了．It's necessary to give students a lesson on safety．．分析 It's necessary to give students a lesson on safety．
解答 答案：It's necessary to give students a lesson on safety．这里是表示做某事是怎么样的，用it做形式主语，to do sth做真正主语，构成句型It is+adj+to do sth，必要的necessary，给学生们上一堂课用give students a lesson，在安全方面用on safety，故答案是It's necessary to give students a lesson on safety．
点评 动词不定式在句中可以作主语，但我们常常用it做形式主语，to do sth做真正主语，来保持句子的平衡
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