状 语 从 句If you are happy and you know it, clap your hand.If the green light isn’t on, wait a minute.If it rains tomorrow,we will not go to the zoo.If you work harder, you’ll pass the exam.如果绿灯没有亮，就等一下。如果感到幸福，你就拍拍手。如果明天下雨，我们就不去动物园。如果你学习更努力，你就会通过考试。If the telephone rings, ___________________._________________, you will be late for school.Look and sayLook and sayI will answer it If you get up lateIf you are ill,______________.If you ride a bike in thestreet,_______________________.you must go to see a doctoryou must be very careful条件状语从句由 if （如果） , unless （ if...not ，除非） , so/as long as （只要）等引导，谈论的是一个有可能发生的事实及其产生的相关的结果，主句用现在时，从句也用现在时；主句用过去时，从句也用过去的某种时态。主将从现具体地讲，主句是一般将来时 ( 包括祈使句和含有情态动词 can, may, must 等 ) ，从句也用一般现在时We won’t wait for him, if he doesn’t come before 12o’clock.We won’t wait for him, unless he comes before 12o’clock.如果他 12 点前不来，我们就不等他了。So long as you keep on trying, you will surely succeed.只要你继续努力，你就会成功。Choose the right answer:1.I'd like to go swimming __the water is not too cold.A. for B. unless C. if D. whether2 . ---Do you know if he __to play basket ball with us? ---I think he will come if he ______ free tomorrow. A. comes; is B. comes; will be C. will come; is D. will come; will be3 . ___ you study harder, you'll never pass the exam.A. If B. Until C. Unless D. Except4 . I’ll go swimming with you if I _____free tomorrow. A. will be B. shall be C. am D. was时间状语从句由连词 when （当……时候） , while （当……时候） , before （在……之前） , after （在……之后） , till/ until （直到） , as soon ...
