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.
(2) 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。
(3) 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。
(4) 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。
(5) 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。
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