初中英语必须掌握的几大时态
<p> 时态是英语学习中一个至关重要的内容，广大初中学生在实际运用时，往往对时态问题倍感棘手，下面我们就归纳复习一下这几种时态。</p><p> 一、一般现在时：</p><p> 概念：经常、反复发生的动作或行为及现在的某种状况。</p><p> 时间状语：<span word="often">often</span>，<span word="usually">usually</span>，<span word="always">always</span>，<span word="sometimes">sometimes</span>，<span word="every">every</span> <span word="week">week</span>（<span word="day">day</span>，<span word="year">year</span>，<span word="month">month</span>．．．），<span word="once">once</span> <span word="a">a</span> <span word="week">week</span>，<span word="on">on</span> <span word="Sundays">Sundays</span>，<span word="etc">etc</span>．</p><p> 基本结构：①<span word="be">be</span>动词；②行为动词</p><p> 否定形式：① <span word="am">am</span> ／<span word="is">is</span> ／<span word="are">are</span> ＋<span word="not">not</span>；②此时态的谓语动词若为行为动词，则在其前加<span word="don">don</span>'<span word="t">t</span>，如主语为第三人称单数，则用<span word="doesn">doesn</span>'<span word="t">t</span>，同时还原行为动词。</p><p> 一般疑问句：①把<span word="be">be</span>动词放于句首；②用助动词 <span word="do">do</span>提问，如主语为第三人称单数，则用<span word="does">does</span>，同时，还原行为动词。</p><p> 二、一般过去时：</p><p> 概念：过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行为。</p><p> 时间状语：<span word="ago">ago</span>，<span word="yesterday">yesterday</span>，<span word="the">the</span> <span word="day">day</span> <span word="before">before</span> <span word="yesterday">yesterday</span>，<span word="last">last</span> <span word="week">week</span>（<span word="year">year</span>，<span word="night">night</span>，<span word="month">month</span>．．．），<span word="in">in</span> 1989，<span word="just">just</span> <span word="now">now</span>，<span word="at">at</span> <span word="the">the</span> <span word="age">age</span> <span word="of">of</span> 5，<span word="one">one</span> <span word="day">day</span>，<span word="long">long</span> <span word="long">long</span> <span word="ago">ago</span>，<span word="once">once</span> <span word="upon">upon</span> <span word="a">a</span> <span word="time">time</span>，<span word="etc">etc</span>．</p><p> 基本结构：①<span word="be">be</span>动词；②行为动词</p><p> 否定形式：① <span word="was">was</span>／<span word="were">were</span> ＋<span word="not">not</span>；②在行为动词前加<span word="didn">didn</span>'<span word="t">t</span>，同时还原行为动词。</p>
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