状语从句知识点总结：状语从句的概念及时态特点
<p>【导语】英语语法让很多学生都头疼，因为复杂难懂的句式和词组有时难以记忆。英语网为大家整理了英语语法大全，希望对同学们的英语语法学习有所帮助。更多内容尽在英语网。</p><p>基本概念</p><p>状语从句 (<span word="Adverbial">Adverbial</span> <span word="Clause">Clause</span>) 状语从句指句子用作状语时，起副词作用的句子。它可以修饰谓语、非谓语动词、定语、状语或整个句子。根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。状语从句一般由连词(从属连词)引导，也可以由词组引起。从句位于句首或句中时通常用逗号与主句隔开，位于句尾时可以不用逗号隔开。</p><p>时态特点</p><p>一般情况下，时间和条件状语从句的谓语动词一般用一般现在时表示一般将来时，用现在完成时表示将来完成时。例如：</p><p><span word="I">I</span> <span word="will">will</span> <span word="call">call</span> <span word="you">you</span> <span word="as">as</span> <span word="soon">soon</span> <span word="as">as</span> <span word="I">I</span> <span word="arrive">arrive</span> <span word="in">in</span> <span word="Beijing">Beijing</span>. 我到北京就将给你打电话。(这是由<span word="as">as</span> <span word="soon">soon</span> <span word="as">as</span>引导的时间状语从句，从句中的谓语动词<span word="arrive">arrive</span>是一般现在时，表示一般将来时，绝不可用<span word="will">will</span> <span word="arrive">arrive</span>)</p><p><span word="As">As</span> <span word="soon">soon</span> <span word="as">as</span> <span word="I">I</span> <span word="have">have</span> <span word="finished">finished</span> <span word="this">this</span> <span word="work">work</span>, <span word="I">I</span> <span word="will">will</span> <span word="have">have</span> <span word="gone">gone</span> <span word="home">home</span>. 我一完成此工作，就回家。(从句中的谓语动词用现在完成时<span word="have">have</span> <span word="finished">finished</span>，表示将来完成时,绝不可用<span word="will">will</span> <span word="have">have</span> <span word="finished">finished</span>)</p><p><span word="If">If</span> <span word="he">he</span> <span word="comes">comes</span> <span word="back">back</span>, <span word="please">please</span> <span word="let">let</span> <span word="me">me</span> <span word="know">know</span>.如果他回来了，请通知我。(从句中的谓语动词用<span word="comes">comes</span> <span word="back">back</span>,表示一般将来时，绝不可用<span word="will">will</span> <span word="come">come</span> <span word="back">back</span>)</p>
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