if引导的条件状语从句精讲与专题练习

初中英语初中英语 if 引导的条件状语从句引导的条件状语从句 引导条件状语从句最常用的连词是 if 常见的 if 条件状语从句表示在某条件下 某事很 可能发生 条件是可能存在的 主句中某种情况发生的概率也是很高的 如 If you ask him he will help you 如果你请他帮忙 他会帮你的 If you fail in the exam you will let him down 如果你考试不及格 你会让他失望的 If you have finished the homework you can go home 如果你作业做完了就可以回家了 另外 if 从句还表示不可实现的条件或根本不可能存在的条件 也就是一种虚拟的条件或 假设 从句多用一般过去时或过去完成时 表示对现在或过去的一种假设 如 If I were you I would invite him to the party 如果我是你 我会邀请他参加聚会 I would have arrived much earlier if I had not been caught in the traffic 要不是交通堵塞 我本 会来得早一些 另外你还要注意 if 条件句的时态搭配 1 if 从句用一般现在时 主句用一般将来时从句用一般现在时 主句用一般将来时 If he runs he ll get there in time 如果他用跑的 他就会及时赶到那儿 The cat will scratch you if you pull her tail 如果你拉猫的尾巴 它就会抓你 2 if 从句用一般现在时 主句用 may might can If the fog gets thicker the plane may might be diverted 如果雾在大一些 飞机可能就会改在别 的机场降落 If it stops snowing we can go out 如果雪停了 我们就可以出去 3 if 从句用一般现在时 主句用 must should If you want to lose weight you must should eat less bread 如果你想减肥 你必须少吃面包 4 if 从句用一般现在时 主句用一般现在时 If you heat ice it turns to water 也可用 will turn 如果把冰加热 它就会化成水 5 if 从句用现在进行时 主句用一般将来时 If you are looking for Peter you ll find him upstairs 如果你是在找彼得 上楼就会找到他 6 if 从句用现在完成时 主句用一般将来时 If you have finished dinner I ll ask the waiter for the bill 如果你吃完了 我就叫服务生来算账 注意注意 学习 if 引导的条件状语从句的用法 现在总结一下 if 条件句不一般条件句不一般 几个要点记心间几个要点记心间 条件句条件句 放在前放在前 逗号要放句中间 逗号要放句中间 条件句表可能 主句多用将来时 条件句表可能 主句多用将来时 条件句表事实 主句常用现在时 条件句表事实 主句常用现在时 在 if 引导的条件状语从句中 如果从句谈论的是一个有可能发生的事实及其产生的相关 的结果 主句用一般将来时态 从句用一般现在时态 如 We can walk there if we can t find a bus If it rains tomorrow we will not go to the zoo What will you do if you find a panda in danger 如果 if 条件句谈论的是重复发生和预示要发生的情景和事件 则主从句大多用一般现在 时态 如 If bears are in danger they attack people 在 if 引导的条件状语从句中 if 和条件句位置灵活 可直接放在主句后面 若 if 条件句 放句首 从句后面要加逗号 和主句隔开 还要注意前后时态一致原则 一 用所给词的适当形式填空 1 If you feel tired you have to have a rest 3 If there be fewer trees there be more pollution 5 If Marcia live alone she keep a pet parrot 6 Lana buy a new dress if the old one be out of style 9 Peter send me a beautiful souvenir if he tour Spain 10 If Mr Green say I am hard working my parents feel glad 11 I go to the beach if it not rain this week 13 He write a letter to his grandparents if he get his report card this week 14 If she get up late she not catch the early bus 15 Peter major in English if he pass the exams in Peking University 16 如果努力学习 你就会取得好成绩 If you you good 17 他如果看电视太久了 他的父母会不高兴 If he TV too much his parents unhappy 18 如果我们为他组织生日聚会 大家都会来的 Everyone if we a birthday party him 19 如果明天不下雨 我会和你一起去公园的 If it tomorrow I go to the park you 21 如果他有空 他会帮助你的 If he he you 23 你如果抄同学的作业就不能学好各门功课 You good at all the subjects if you the other students homework 单项选择 15 分 1 If you to the party you ll have a great time A will go B went C go D going 2 It will be a long time Peter his work A since has finished B after finishes C when will finish D before finishes 3 What will father us from Japan A take B bring C carry D make 4 Weifang is famous kites A for B to C on D with 5 I her the answer if she me A can tell will ask B will tell will ask C would tell ask D will tell asks 6 What are you going to do tomorrow We ll go to the library tomorrow if it A isn t rain B rain C won t rain D doesn t rain 7 Do you know when he will come back tomorrow Sorry I don t know When he back I ll tell you A comes B will come C come D may come 8 What will you do if you to the old folk s home visit A go B went C going D will go 9 If I eat food I ll be very fat A too many B many too C too much D much too 10 I ll give the book to him if he here next Sunday A will come B comes C is coming D came 11 There an English film in our school tomorrow A is going to have B will have C is going to be D has 12 Could you tell us where A will the next Olympic Games held B the next Olympic Games will be held C would the next Olympic Games be held D the next Olympic Games would be held 13 When my mother returned last night I a book A read B am reading C was rea