1、I. if引导的宾语从句 if 引导宾语从句时，意思为：是否，从句的时态通常要和主句保持一致。 【例句】 I want to know if he lives there. 我想知道他是否住在那儿。 He asked me if I could help him. 他问我是否能帮他。时态： if或whether引导的宾语从句应和主句的时态保持一致。九字真言：“主过从过，主现从不限”。即主句为一般过去时，从句则用过去时中的任一种时态（一般过去时，过去将来时，过去完成时，过去进行时）。主句为一般现在时
2、，从句用任一种时态，要具体问题具体分析；语序：宾语从句的前身是疑问句，改为宾从要用陈述句语序。2.if引导的条件状语从句You will catch the bus if you get up early. 如果你早起的话，就能赶上公共汽车【例句】 If you want to go, please tell me. 如果你想去，请告诉我。 Print the photo if you like it. 如果你喜欢这照片就把它打印出来。时态：主将从现：指if引导的条件状语从句用一般现在时，主句
3、用一般将来时主祈（情）从现：主句是祈使句, 从句是由if引导的使用一般现在时的句子。用法口诀条件句不一般，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，主将从现不一般；条件句表虚拟，主句常用三大金刚加原形。If还有“是否”意，宾语从句放后边。习题：1.Do they want fried chicken? He asked the boys.（改为宾语从句) He asked the boys _______they ______fried chicken. 2.Was t
4、he watch made in Shanghai? I don’t know.(改为宾语从句) 3.翻译：如果明天不下雨，我就和同学们去野餐。 If it _________ (not rain)tomorrow, _________(let) us go shopping.5.IfIwereyou,I________(invite)himtotheparty.4.混合体【考题链接】 I dont know _________ he will come tomo-rrow. _________
5、he comes, I’ll tell you． A. if; Whether B. whether; Whether C. if; That D. if; If一、用所给动词的适当形式填空。 1. If you ________(feel) tired, you _______________ (have) to have a rest. 2. Where _______ he
6、_________(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 _____________
7、(live) alone, she ___________________(keep) a pet parrot. 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 _
8、____________(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
