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1. ...I shouldn’t have been so difficult at school. 句中shouldn’t have been表示过去本不该做的事却做了，should have done意为过去本来该做而未做。 [句子仿写] 今天上午我本该给埃德打电话，但是我忘了。 I ________________________ Ed this morning，but I forgot. 答案：should have phoned 2．I decided that it was time I became an Internet user. 该句中It is/was time(that)．..表示“是……的时候了”。It’s time that...句型中，从句谓语动词多用虚拟语气形式。 [句子仿写] 我们早该讨论这个问题了。 It is high time we ________________________ this problem. 答案：began to discuss 3．In the past，if someone like me had failed to get into university through the college exam，he would have had no chance of getting a degree. 此句包含if引导的虚拟条件句。在虚拟条件句中如果与过去的事实相反，条件句中谓语部分应用“had＋pp.”的形式，主句部分谓语用would have done的形式。 [句子仿写] 如果他昨天见到你，他会问你这件事的。 If he ________________ you yesterday，he______ __________________ you about it. 答案：had seen; would have asked 教材复习 第一部分 Unit 15 Learning Section Ⅰ 课前预习，落实基础 1. I wasn’t very good at most school’s s________. 答案：subjects 2．The angles of a t________ add up to 180 degrees. 答案： triangle 3．People were unwilling to c________ what they had always comfortably believed. 答案：challenge 4．My mind went blank and my heart s________ | 
