小议It is + time + clause
It is + time + clause是英语中一个常用句型，也是高考必须把握的热点和难点，现归纳如下：
一、用在when引导的定语从句中， 其功能相当于一个由并列连词连接的分句
例 It was October the thirty-first when we went to Beijing. =It was October the thirty-first and on that day we went to Beijing.我们是12月31号去的北京。
二、 用在that引导的强调句中。注意时间前介词的应用
例 It was on October the thirty-first that we went to Beijing.就是在12月31号我们去的北京。
It is on Saturday when the meeting will be held. 就是在星期六开会。
三、用在since引导的状语从句中
例 It is two years since he left his hometown. 他离开家已两年了。
注：如果是延续动词则表示从这个动作结束。
例 It is five years since he worked here. 他不在这儿工作已5年了。
四、 用在before引导的状语从句中。这是一个常用句式，常译成“……以后”
例 It will be five years before we meet again. 五年后我们再见面。
It will be at least three years before he forget about it. 至少3年后他才会忘记这件事。
五、 和 until连用， 用于强调表示时间的名词和时间状语，可用It was not until… that… 句型，意为“直到…… 才…… ”，需注意not的位置
例 It was not until the 1950s that black people were denied the vote in the US.直到20世纪50年代 美国黑人才获得选举权。
It was not until his mother came back that the boy stopped crying. 直到妈妈回来，这个小男孩才不哭了。
六、 It is time +过去式
例 It is （high） time we went to bed.我们该睡觉了。
It is time I went to pick up my child. 我该去接孩子了。
「真题再现」
1. —Did Jack come back early last night ？
—Yes. It was not yet eight o’clock＿＿＿＿＿＿＿he arrived home.（2005福建）
A. before B. when C. that D. until
解析 此题考察的是定语从句，先行词是表示时间的名词，应用when来引导，所以正确答案是B.
2. It was some time ＿＿＿＿＿ we realized the truth.（2005山东）
A. when B. until C. since D. before
解析 此题的意思是“过了一段时间后我们才知道真相”也就是说在知道真相之前有一段时间，所以正确答案是D.
3. It was really a splendid evening. It’s years ＿＿＿＿＿＿＿ I enjoyed myself so much. （2005安徽）
A. when B. that C. before D. since
解析 此题的意思是“我好几年没玩的那么尽兴了”，enjoyed是一个时间点，应用since来引导， 所以正确答案是D.
4. It wasn’t until a month later ＿＿＿＿＿＿ I received the manager’s reply.（2005全国I）
A. since B. when C. as D. that
解析 此题考查的是强调句式，所以正确答案是D.
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