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(1)until用于肯定句时，表示主句的动作到until所表示的时间结束，所以主句的谓语动词必须为延续性动词。until用于否定句时，意思是“直到……才”，即表示主句的动作到until所表示的时间才开始，主句的谓语动词用短暂性动词。 ①If I ride a bike，I’ll always keep to the right and never cross a road until the traffic light turns green. (2017·安徽高考书面表达) 如果我骑自行车，我会靠右行走，等到交通信号灯是绿灯时才过马路。 ②Until I came here，they’d always been in London area. 直到我来这儿之前，他们一直住在伦敦地区。 (2)对该句型进行强调，可以采用下列两种方式： ●将not until引导的从句置于句首，此时主句要用部分倒装。 ③Not until the teacher entered the classroom did the students stop talking. 直到老师进了教室学生才停止说话。 ●使用It is/was...that强调句型，即It is/was not until＋从句/表时间的词＋that... ④It was not until five men went into the tower and only four left that they were finally able to fool the crow. (2017·广东高考完形填空) 直到五个人进入塔中而四个离开时，乌鸦才最终被蒙蔽了。 [链接高考] (2017·福建高考改编)Not until he went through real hardship did he realize the love we have for our families is important. 直到他经历了真正的困难他才意识到我们对家人的爱是那么重要。 [学以致用] Ⅰ.句型转换 1．The crowd didn’t leave until the performance was over. →Not until the performance was over did the crowd leave． 2．He didn’t know the importance of them until he lost what he had. →It was not until he lost what he had that he knew the importance of them. Ⅱ.完成句子 1．It is/has been five years since I visited the palace. 自从我参观那个宫殿以来已经五年了。 2．His father has given up smoking.It is/has been 3 years since he smoked． 他爸爸已戒掉了抽烟。他已经三年不抽烟了。 3．It’s been years since I enjoyed myself so much as last night. 我已经好几年没有像昨晚玩得那么开心了。 4．Not until he got seriously ill did he realize the importance of health. 直到他病得很严重，他才意识到健康的重要性。 | 
