2017年中考英语二轮语法专题复习课件之连词要点.ppt

2.?当句子为肯定句时，until表示主句的动作一直持续到until从句动作发生或状态出现为止，一般意为“一直到……时(为止)”，这时主句中的动词为延续性动词。当句子为否定句时，until表示主句的动作在until从句动作发生或状态出现之后开始，这时意为“直到……才……”。 3.?当since引导的从句用一般过去时时，主句常用现在完成时。 4. 当before 引导的从句用一般过去时的时候，若主句的动作在从句动作发生以前已经发生，则主句用过去完成时；若只强调主句的动作发生在过去，则主句可用一般过去时。 1. Some people wont realize the importance of their health ______ they have lost it. A. when B. until C. after (2015 四川自贡) 【中考链接】 2. —Did you catch the first subway this morning? —No, I didnt. It had started moving ______ I could get on it. A. before B. since C. after D. as soon as (2015 湖北襄阳) 3. —How long will you stay here? —______ I finish my homework, Ill go back home. A. As soon as B. While C. Unless (2015 山东威海) 4. —Excuse me, may I come in? —Not yet. Please wait on your chair ______ your name is called. A. and B. until C. after D. since (2015 内蒙古呼和浩特) 5. Wu Yi will help with the housework ______ he gets home after school. A. since B. While C. as soon as (2015 四川成都) 6. ______ the dinner was all over, everyone helped wash the dishes. A. How B. When C. Before D. Why (2015天津) 7. Miss Lin has taught us English ______ we came to this school. A. for B. since C. before D. when (2015 重庆B卷) 8. —Its too late. I have to go now. —Oh, its raining heavily outside. Youd better wait here ______ it stops. A. until B. since C. while D. though (2015 山东烟台) 9. My father was drinking tea in the living room ______ my mother was doing the dishes in the kitchen. A. if B. while C. until D. unless (2015 四川内江) 10. I was very excited ______ I heard the news that the high-speed rail would be built from Guangzhou to Xiamen.