第07练 if引导的条件状语从句-2023【暑假分层作业】八年级英语（人教版）

第07练 if引导的条件状语从句 一、if做如果讲引导的条件状语从句： 用法 例句 （主将从现）主句为一般将来时，if引导的从句用一般现在时 If we drop litter in a public place, we’ll be fined by the police. 如果我们在公共场所扔垃圾，我们会被警察罚款。 If you always expect too much from life,you will not be happy. 如果你总是对生活期望过高，你就不会快乐。 （主情从现）主句中含有情态动词，if引导的从句用一般现在时 If you keep on studying hard ,you can achieve success. 如果你坚持努力学习，你就能取得成功。 （主祈从现）主句为祈使句时，if引导的从句用一般现在时 If you want to improve yourself，don't waste time questioning yourself. 如果你想提高自己，不要浪费时间质疑自己。 （主过从过）主句的时态是过去的某种时态时，if从句也要用过去的某种时态； If I were you，I wouldn't do it like that. 如果我是你，我不会那样做。 二、条件状语从句的同义句转换： 1、借助“祈使句+and (or)+一般将来时的句子”这一句型来转换。and在句意上表示顺承关系，or表示转折关系。如： If you get up early, you’ll catch the early bus. Get up early, and you’ll catch the early bus. 祈使句，and sb will do sth Get up early, or you won’t catch the early bus. 祈使句，or sb won't do sth 2、If引导的条件状语从句可以转化为介词短语 with/without 结构 I can't achieve success if you don't help me. （同否即否） I can't achieve success without your help. l can achieve success if you help me （同肯即肯） I can achieve success with your help 3、unless=if...not. I can't achieve success if you don't help me. （前否后否） I can't achieve success unless you help me 4、if与as/so long as 引导的条件状语从句进行同义转换,“只要”,“如果”。 You will achieve success as long as /if you work hard. 一、选择题 1．（2022春·辽宁鞍山·八年级统考期中）—Do you want to go to the party? —If my best friend _______ go, neither _______ I. A．doesn’t, do B．won’t, am C．doesn’t, will D．won’t, do 【详解】句意：——你想去参加聚会吗？——如果我最好的朋友不去，我也不会去。 考查助动词辨析和条件状语从句的时态。if引导的条件状语从句，主句用一般将来时，从句则用一般现在时，即“主将从现”。结合句意可知，“If my best friend…go”是从句，所以时态应是一般现在时，所以第一空选doesn’t；“neither…I”是主句，所以应用一般将来时，所以第二空选will，表示将来、将要。故选C。 2．（2022春·云南保山·八年级统考期中）It ________ much easier for people in Kunming to go to Chongqing ________ the Chongqing-Kunming High-speed Rail is built. A．will be; unless B．will be; if C．was; as soon as D．was; as long as