高考一轮复习四个易混句式结构的辨析及专项练习

四个易混淆的结构 “It’s...that...”，“ It is ... since ...”，“ It is ... before...”和“ It is ... when ...”是四个形似的句子结构，填对连词不容易。 1.“It’s...that...” ①当it 为形式主语时，that等为主语从句的连词，例如： It is quite clear that he has read the book. 很显然, 他读过这本书。 It’s a problem where we could get so much money. 我们到哪里去弄这么多钱, 这是一个难题。 ②It is（was）＋被强调的部分＋that（who）＋原句其它部分”来强调说话人的意愿： 例句：It was on Monday night that all this happened．所有这一切发生在周一晚上. It's me that he blamed．他怪的是我. 2. “ It is ... since ...” It is + 时间段 + since…， 如果since后从句中常用非延续性动词,意思是“某人做某事有多长时间了”。 例如： It is / has been four days since I caught a cold. 我感冒已四天了。 It is/ has been three years since his brother joined the army. 他哥哥入伍三年了。 如果since后从句中用延续性动词，则表示“某人不做某事有多长时间了”。 例如： It’s years since I enjoyed myself that much . 我好多年没有玩得那么开心了 3. “ It is ... before...” ① “It was not long before...” 表示“没过多久就会... ...” 例如： It was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash. 没过多久一架直升飞机就到达现场，来营救坠机的幸存者. ② “It will be + 时间段 + before...” 表示“... .