初中英语if条件句

精品文档 1欢迎下载 定义 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 E g If you ask him he will help you 如果你请他帮忙 他会帮你的 E g 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 E g 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 E g 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 E g 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 另外你还要注意另外你还要注意 ifif 条件句的时态搭配条件句的时态搭配 1 if 从句用一般现在时 主句用一般将来时 E g If he runs he ll get there in time 如果他用跑的 他就会及时赶到那儿 E g 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 E g 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 E g 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 E g 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 E g 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 精品文档 2欢迎下载 E g 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 E g 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 几个要点记心间 条件句 放在前 逗号要放句中间 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 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 E g We can walk there if we can t find a bus E g If it rains tomorrow we will not go to the zoo E g 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 E g 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 经典练习经典练习 一 单项选择 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 精品文档 3欢迎下载 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 二 在正确的答案下划一条线 精品文档 4欢迎下载 1 Daina will go go goes to Europe if she will pass pass passes the exams 2 The graduates will teach teach teaches in the poor village if the Ministry of Education will agree agree agrees soon 3 If there will be are is a car accident they will call call calls 110 for help at once 4 If it won t don t doesn t isn t rainy we will take take takes walk outside 5 If a UFO will land land lands in front of me I will go go goes in to look for the alien 6 If he will have have has money he will bulid build builds a science lab 7 Don t wait for me if I am will be late 8 They won t don t go to the beach if it will rain rain rains 9 I will call call you if he will stay stay stays at home 10 Mr Smith will let let lets you know if he will need need needs help 11 Will Do Does he visit the museum if he won t don t doesn t get tired 12 Where will do does they live if they will miss miss misses the bus 三 用所给词的适当形式填空 1 If you feel tired you have to have a rest 2 Where he see the film if he have time 3 If there be fewer trees there be more pollution 4 He dress more casually if he not work on weekends 5 If Marcia live alone she keep a pet parrot 精品文档 5欢迎下载 6 Lana buy a new dress if the old one be out of style 7 The twins fight if they argue 8 I have a bake sale if I need money for education 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 12 they have a match if the P E teacher be busy 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 三 翻译句子 1 如果他到的晚了会发生什么事情 What if he late 2 如果努力学习 你就会取得好成绩 If you you good 3 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 4 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 5 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 6 如果她睡过头了 就会旅游迟到的 She the trip if she 精品文档 6欢迎下载 7 如果他有空 他会帮助你的 If he he you 8 如果 Tom 考试不及格 他就没有机会上高中了 Tom have the to go to the high school if he the exams 1 If she not get home on time her mom will be worried 2 If Tom works hard he make a lot of money 3 If I study hard my dream 实现 4 If he 争论 his friend he will be very sad 5 If you fight with your brother what 发生 6 Call me if he 回来 7 He can make great progress if he 追随 听从 my advice 8 If I find his phone number I you A tell B told C will tell D have told 9 I the CDs to you if I have time tomorrow A will return B returned C have returned D return 10 The students will go to the Summer Palace if it tomorrow A won t rain B isn t raining C doesn t rain D isn t rain 11 I won t watch the TV play if my father me do my homework A let B will let C won t let D lets 12 If you quiet I ll tell you what happened A will B are C are to be D be 13 If you go to the party you a good time A would have