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1、if 引导的条件状语从句引导的条件状语从句if 条件句：条件句用于陈述语气，表示假设的情况可能发生，其中 if 是 “如果”的意思。 用用 法法 例例 句句 主句为一般将来时态，if 从 句用一般现在时态（即主将从现） 。We will stay at home if it rains tomorrow. 如果明天下雨，我将要呆在家。 主句中含有情态动词，if 从 句用一般现在时态。If you finish your homework, you can go home now. 如果你做完了作业，你现在 可以回家了。 主句为祈使句，if 从句用一 般现在时态。Dont jump into t
2、he river if you feel very hot. 如果你感到很热，不要跳入河里。 主句为过去将来时，if 从句 用一般过去时态（如果涉及到 be 动词，一律都用 were）。此 时，表达的是和现实相反的推测， 用虚拟语气。If I were you, I wouldnt do it like that.如 果我是你，我就不会那么做的。 If you gave me some money, I would be very happy. 如果你给我一些钱，我就 会很高兴的。构 成条件从句主 句时 态If一般现在时主语shall/will+动词原形例 句If he comes,he wi
3、ll take us to the zoo.1)用法： (1)条件状语从句通常由连词 if 引导，意为“如果、假如”，主句不能用 be going to 表示将来，而应该用 shall，will。If you leave now, you are never going to regret it. (错误)If you leave now, you will never regret it. (正确正确) (2)if “如果如果”，引导条件状语从句，主句用一般将来时，从句则用一般现，引导条件状语从句，主句用一般将来时，从句则用一般现 在时，如：在时，如：If it rains tomorrow
4、, I shant climb the hills. (3)另外，主句是祈使句或含有情态动词，从句也用一般现在时。如： Please call me if he comes next Sunday. Can you call the policeman if you are in the trouble.注意注意 宾语从句中的 if 与条件状语从句 if 的区别。宾语从句中的 if“是否” 相当于 whether，引导宾语从句，时态需根据语境确定。如果主句用一般现在 时，从句可以根据具体情况选用时态，如果主句用一般过去时，从句必须用过 去式的某种形式。 I dont know if it wi
5、ll rain tomorrow. 我不知道明天是否会下雨。 Our teacher said there was going to be a football match the next month.我们说 下月将有场足球比赛。【边学边做】用括号内所给词的正确形式填空。 1. What will you buy if you _（have）a lot of money? 2. If it _（not snow）tomorrow, we will feel unhappy. 3. You mustnt go to school if you _（be）still in bed. 4. If
6、he _（be）at home at that time, he would know it. 5. Please show me the way if you _（know）it. 6. You will hurt your teeth if you _（eat）too much candy. 7. If you gave me a toy car, I _（be）very happy. 8. I would get the prize if I _（work）hard. 9If she _ (finish ) work early ,she _(go) home. 10If the wea
7、ther_（be）fine，we_(go)for a walk . 11. If I_(have) time tonight ,I _(finish) the book Im reading. 12. If it _(rain) next weekend , we_(not be able to ) plant the vegetable . 13. If it_(rain),we_(stay) at home . 14.If she_(arrive) ,she _(phone) me . 15. If he_(call),tell him Ill ring back . 二、用所给词的适当形
8、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.6. Lana _ (buy) a
9、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 bea
10、ch 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
11、 University.二、完成句子1. 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.2. 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.3. 如果他有空，他会帮助你的。If he _ _, he _ _ you.4. 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.5. 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.
