if 引导的条件状语从句引导的条件状语从句2021/6/301(1) if从句的构成从句的构成当我们要表示当我们要表示“如果如果”时时,就会用到就会用到if引导的引导的条件状语从句。条件状语从句。 if引导的条件状语从句表示在某种引导的条件状语从句表示在某种条件下某事很可能条件下某事很可能/不可能发生。它的构成有：不可能发生。它的构成有： if从句从句（一般现在时）（一般现在时） + 祈使句祈使句 if从句从句（一般现在时）（一般现在时） + 陈述句陈述句（将来时）（将来时） If you need help, please call me. If you want to know more about it, please telephone our teacher. If it rains tomorrow, we will not go to the zoo. She will come to see me if she has time.其中其中if引导的是一个完整的句子，一定要有引导的是一个完整的句子，一定要有主语主语。2021/6/302(2) if从句的位置从句的位置 if引导的条件状语从句既可放在主句之后引导的条件状语从句既可放在主句之后,又可放在主句之前又可放在主句之前(但须用逗号隔开但须用逗号隔开)。 Print the text if you like it.If you like the text, print it.Look at the blackboard if you cant remember the words.If you cant remember the words, look at the blackboard.2021/6/303时态时态主将从现主将从现 主将从现指主将从现指if条件状语从句用一般现在时，主句用一条件状语从句用一般现在时，主句用一般将来时。般将来时。 If it doesnt rain tomorrow, well go to the park. If you dont get up early, you will be late for school. If I play games on it, it will go wrong. 主情从现主情从现 即主句是含有情态动词的句子，从句仍然是一般现即主句是含有情态动词的句子，从句仍然是一般现在时的句子。在时的句子。 If all your answers are right, you can go to Hainan for holiday. You may stay to dinner if you like. 2021/6/304If引导的引导的条件状语从句条件状语从句 VS if引导的引导的宾语从句宾语从句He will call you if he comes back. 如果他回如果他回来，他会给你打电话。来，他会给你打电话。（此句（此句if表表如果如果，是条件状语从句，所以用，是条件状语从句，所以用主将从现主将从现。）。）I dont know if he will come back. 我不知道我不知道他是否会回来。他是否会回来。（此句（此句if表表是否是否，相当于，相当于whether，引导宾，引导宾语从句语从句, 所以不遵循主将从现，所以不遵循主将从现，应根据实际应根据实际情况选择时态情况选择时态。）。）2021/6/305Exercise1. If it _ fine tomorrow, we _ a picnic. A. be; have B. is; will have C. will be; will have2. If you bring snacks to the party, the teachers _. A. take it away B. will take them away C. took away them3. I will give the book to him if he _here next Sunday. A. come B. will come C. comes4. I dont know if he _here tomorrow. A. will come B. comes C. comeBBCA2021/6/306如果我有足够的钱，我将环游世界。如果我有足够的钱，我将环游世界。 If I _, I _. 如果你累了，休息一下。如果你累了，休息一下。 If you are tired, _.如果我们找不到公交车，我们可以走去那里。如果我们找不到公交车，我们可以走去那里。 We can walk there if we _.如果你想了解它是怎样工作的，请阅读说明。如果你想了解它是怎样工作的，请阅读说明。 If you _, please _.如果你告诉她真相，你将证明你是多么诚实。如果你告诉她真相，你将证明你是多么诚实。 If you_, you_. tell her the truth will prove how honest you arehave enough moneywill travel around the worldhave a rest cant find a buswant to know how it worksread the instructions2021/6/307Page. 44 Part. 51. turn on2. will hear3. follow4. call5. dont know6. will send7. will give8. will win9. will not choose2021/6/308Page. 44 Part 6 1. -What should I do if I want to work in radio? -You should keep studying hard. 2. -What should I do if I want to find the information? -You should use the Internet.3.-What should I do if I want to make friends? -You should talk to people and be kind. 4.-What should I do if I want to be in the sports team? -You should practise sport.2021/6/309 结束语结束语若有不当之处，请指正，谢谢！若有不当之处，请指正，谢谢！