初中从句讲解.doc

状语从句状语从句(一)时间状语从句:由 when, while, before, after, since, as soon as, till / unti l 引导的从句 1. when 与 while )I ’ ll tell her the good news es back. 2)Aunt Wang came in while we were watching TV 2. since: 自从……以来(since + 一般过去时) 而主句通常用现在完成时 has lived there since he came to China (二)条件状语从句:由 if( 如果) 引导的从句(主将从现) will go to the park if it ________ (not rain) tomorrow. 注意:条件状语从句与以下句型的同义句转换 1 )祈使句, and (then , or)+ 简单句= If you …, you … eg. Hurry up, or you ’ ll be late.=If you don ’t hurry, you ’ ll be late. 2) without 与条件句的转化 eg. Man can ’t live without water. =Man can ’t live if there is no water. 注意以上两种状语从句的时态主句从句一般将来时祈使句情态动词一般现在时一般过去时过去时但 since 从句+ 一般过去时,主句与现在完成时连用。 )I ’ ll call you as soon as he ______ (come) back. 2)He won ’t go to bed until he _________ (finish) his homework. 3)I ’ ll help you ifI _____ (be) free tomorrow 4)I ___________ (live) here since I came to China. (三)原因状语从句:由 because, since , for , as 引导的从句 eg. He didn ’t go to school because he was ill. 注意: 1)对 because 引导的从句提问用 why 2) 有了(because), (so) 不能连用 eg. Because he was (A) ill, so (B) he didn ’t (C) go to school (D) yesterday. (四)结果状语从句:由 so… that 引导的从句( so 后接形、副原级) eg. He ran (A) so faster (B) that I couldn ’t catch up with (C) him . 注意: 1)“ so… that + 否定句”与“ too … to”的替换 )He is so young that he can ’t go to school. = He is too young to go to school( 主、从句主语相同) 2)He ran so fast that we couldn ’t