初中英语时态知识点：一般过去时三种变化技巧
<p> 一变：肯定句变为否定句</p><p> 【技巧1】当句中含有情态动词或助动词<span word="could">could</span>，<span word="would">would</span>，<span word="should">should</span>等时，可直接在其后面加<span word="not">not</span>构成否定句。例如：</p><p> <span word="I">I</span> <span word="could">could</span> <span word="get">get</span> <span word="you">you</span> <span word="a">a</span> <span word="concert">concert</span> <span word="ticket">ticket</span>.<span word="I">I</span> <span word="could">could</span> <span word="not">not</span> / <span word="couldnt">couldnt</span> <span word="get">get</span> <span word="you">you</span> <span word="a">a</span> <span word="concert">concert</span> <span word="ticket">ticket</span>.</p><p> 【技巧2】当句中含有系动词<span word="was">was</span>，<span word="were">were</span> 时，可直接在其后加<span word="not">not</span>构成否定句。例如：</p><p> <span word="I">I</span> <span word="was">was</span> <span word="on">on</span> <span word="the">the</span> <span word="Internet">Internet</span> <span word="when">when</span> <span word="you">you</span> <span word="called">called</span> <span word="me">me</span>.<span word="I">I</span> <span word="was">was</span> <span word="not">not</span> / <span word="wasnt">wasnt</span> <span word="on">on</span> <span word="the">the</span> <span word="Internet">Internet</span> <span word="when">when</span> <span word="you">you</span> <span word="called">called</span> <span word="me">me</span>.</p><p> 【技巧3】当句中谓语是除情态动词、助动词、系动词<span word="was">was</span>,<span word="were">were</span>以外的动词时，在该动词之前加<span word="did">did</span> <span word="not">not</span> / <span word="didnt">didnt</span>，动词还原，构成否定句。例如：</p><p> <span word="The">The</span> <span word="famous">famous</span> <span word="singer">singer</span> <span word="sang">sang</span> <span word="some">some</span> <span word="Chinese">Chinese</span> <span word="songs">songs</span>.<span word="The">The</span> <span word="famous">famous</span> <span word="singer">singer</span> <span word="did">did</span> <span word="not">not</span> / <span word="didnt">didnt</span> <span word="sing">sing</span> <span word="any">any</span> <span word="Chinese">Chinese</span> <span word="songs">songs</span>.</p><p> 二变：陈述句变为一般疑问句</p><p> 【技巧1】移动词语的位置。将<span word="was">was</span>，<span word="were">were</span>,<span word="could">could</span>，<span word="would">would</span>，<span word="should">should</span>等移到句首。例如：</p><p> <span word="He">He</span> <span word="could">could</span> <span word="pack">pack</span> <span word="his">his</span> <span word="things">things</span> <span word="himself">himself</span>.<span word="Could">Could</span> <span word="he">he</span> <span word="pack">pack</span> <span word="his">his</span> <span word="things">things</span> <span word="himself">himself</span>?</p><p> 【技巧2】添加助动词<span word="did">did</span>。谓语是除情态动词、助动词、系动词<span word="was">was</span>,<span word="were">were</span>以外的动词时，在主语之前加<span word="did">did</span>，动词还原。例如：</p><p> <span word="Mr">Mr</span> <span word="Li">Li</span> <span word="looked">looked</span> <span word="very">very</span> <span word="old">old</span>.<span word="Did">Did</span> <span word="Mr">Mr</span> <span word="Li">Li</span> <span word="look">look</span> <span word="very">very</span> <span word="old">old</span>?</p><p> 三变：陈述句变为特殊疑问句</p>
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