Question

句型转换（共10个空，每空0.5分，满分5分）
小题1: Going to sleep early is important for the teenagers.
__________  _________  _________  for the teenagers to go to sleep early.
小题2: You should read more English books.
You  ________  _________ read more English books.
小题3:He had to stay up late last night because he hadn’t recited NCE.(改为否定句)
He ________  _________  _________ stay up late last night because he had recited NCE.
小题4: If it doesn’t rain tomorrow, we will climb Baiyun Hills.
We will climb Baiyun Hills _________ it _________ tomorrow.

Answer 1

小题1:It is important 
小题2:ought to
小题3:didn’t have to
小题4:unless… rains

试题分析：
小题1:句意：早睡是对年轻人很重要的。这里是it is+形容词+for sb to do ，it是形式主语，真正的主语是to go to sleep early ，故用It is important。 
小题2:句意：你应该多读英语书。这里should=" ought" to “应该”，故用ought to。
小题3:句意：他不得不熬夜因为他没有背下来新概念英语。因为谓语动词是had to，变否定句的时候应该用助动词didn’t 来帮助构成，故用didn’t have to。
小题4:句意：如果明天不下雨，我们将去登云台山。这里if …not =" unless" ；unless引导的是条件从句不能用将来时而用一般现在时，故用unless… rains。