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连词主要有：when as while before after until as soon as since等 (1)区别when, as, while的用法 ①.when"当......时候"引导的时间状语从句，其动词既可以是延续性动作的动词，也可以是瞬间性动作的动词,如： _________ the students heard the teacher's footsteps, they all stopped talking. 当学生们听到老师的脚步声时，他们都停止了讲话。(从句动作发生在前) ② as"当.......时候"或"一边.......一边"引导的时间状语从句其动词的动作是延续性的，而且侧重表示主句和从句的动作并相发生： We were having breakfast __________ she was combing her hair. 她梳头时我们在吃早饭。 ③ while表示"在某一段时间里"或"在……期间"，其所引导的从句的动作是延续性的，并侧重表示和主句的动作同时发生。如： I can learn ________ I work. 我可以边工作边学习。 用when, as, while填空： ________ you came in, I was talking with a few boys. It started to rain __________ we were playing outdoors. They talked _________ they walked down the river. __________ it was raining, the students were playing basketball. Her brother watched TV__________ he ate supper. (4) before引导的时间状语从句，指时间上的"在……之前" I'll be back _______________________________________________. 你离开之前我就会回来。 (5) as soon as表示"一……就"，做题要注意主将从现 As soon as we __________ (get) there, he ___________ (tell) us the news. 我们一到那，他就会告诉我们那个消息。 (7) since引导的时间状语从句，从句的谓语动词通常为一般过去时，主句的谓语动词通常为现在完成时 We __________ never __________ (meet) since we ___________ (graduate) from the college. 大学毕业后我们就再没见过面。 (8) till/until引导的时间状语从句 till和until同义，作"直到……时(为止)"解，till多用于非正式文体，until多用于句首;not … until通常与after进行转换。如： I won't go with you until(till) I finished my homework. =____________________________________________________________________. 等我做完作业我才和你一起去。 新初三快扫码关注 中考网微信公众号 每日推送学习技巧，学科知识点  (责任编辑：admin) |