微课if教学课件.pptVIP

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授课教师:王元元 if if 如果 (引导条件状从,符合主将从现原则) 是否 whether ≈ e.g. If it is sunny tommorrow, i will go fishing with you. 宾从中的是否 if=whether e.g. I dont know whether (if) he can come. 1.whether…or (not) 2.介词后是否用whether 3.主从,表从和同位语从句中是否用whether 即只能用whether的三种情况: if≠whether 有关if的词组的考查: 1. if only 所引导的从句用虚拟语气 e.g. If only i were you.(与现在相反) If only i had studied hard.(与过去相反) 主句用倒装语序 e.g. Only if you study hard can you pass the exams. Only if you come with me will i go home. 2. only if 尽管,即使 不与but连用 e.g. Even if he is little, he knows a lot. They will stand by you even if you dont succeed. 好像 所引导的从句与实际情况不符时用虚拟语气 e.g. He talks as if he knew where she was.(与现在相反) The girl listened as if she had been turned to stone.(与过去相反) 3.even if =even though 4.as if = as though 如果可能的话 e.g. If possible, i will always be with you . 如果有必要的话 e.g. If necessary, i can tell you my telephone number. 如果这样的话 e.g. Are you free this evening?If so,lets go out for a meal. 如果不这样的话 e.g. Are you free this evening?If not, see you tomorrow. 5. if possible if necessary if so if not 练习题: 1. If he ________(study) hard, he will get good grades. 2. I want to know if Mary _______(go) to the party tomorrow. 3. There is no doubt_______he can come. 4. There is some doubt ________ he can come. 5. The teacher treats me as if i ________(be) her own child. 6. He pretended as if nothing _______________(happen) last night. studies will go that whether were had happened 7. I dont care about if he is rich. 8. If he can come is a question. 9. The question is if he can succeed. 10. Even if he had the money, but he wouldn’t buy it. 11. 要是我早起就好了。(if only) If only i had got up early. 12. 只有你对学习感兴趣,你才会学习好。(only if) Only if you are interested in learning will you learn well. if------whether if------whether if------whether

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