小升初英语语法：助动词did
<p> 1. 到底何时使用<span word="did">did</span>?</p><p> <span word="did">did</span>和其它助动词一样，本身无意义，自己不能独立作谓语，只能和其它主要动词一起构成谓语，用于构成一般过去时的否定句和疑问句，当然也常常用于代替上文中的行为动词的过去式。如:</p><p> <span word="I">I</span> <span word="didnt">didnt</span> <span word="go">go</span> <span word="to">to</span> <span word="school">school</span> <span word="last">last</span> <span word="Sunday">Sunday</span>. 上周日我没上学。</p><p> <span word="Did">Did</span> <span word="you">you</span> <span word="buy">buy</span> <span word="a">a</span> <span word="new">new</span> <span word="pen">pen</span> <span word="yesterday">yesterday</span>? 昨天你买了枝新钢笔吗?</p><p> 2. <span word="did">did</span>身后的动词到底用什么形式?</p><p> 有的小朋友总不注意<span word="did">did</span>身后的动词用什么形式，在否定句和疑问句中，</p><p> <span word="did">did</span>身后的动词必须用原形。 他昨天没有在家吃午饭。</p><p> [误] <span word="He">He</span> <span word="didnt">didnt</span> <span word="had">had</span> <span word="lunch">lunch</span> <span word="at">at</span> <span word="home">home</span> <span word="yesterday">yesterday</span>.</p><p> [正] <span word="He">He</span> <span word="didnt">didnt</span> <span word="have">have</span> <span word="lunch">lunch</span> <span word="at">at</span> <span word="home">home</span> <span word="yesterday">yesterday</span>.</p><p> 3. 我能用<span word="be">be</span>动词代替吗?</p><p> 不管怎么说，含有行为(实义)动词的一般过去时的肯定句变成否定句或疑问句时，不能用<span word="be">be</span>动词，必须用到<span word="did">did</span>!含<span word="be">be</span>动词的句子构成否定句或疑问句都绝不会让<span word="did">did</span>露面! 例句：<span word="They">They</span> <span word="went">went</span> <span word="to">to</span> <span word="the">the</span> <span word="park">park</span> <span word="last">last</span> <span word="week">week</span>. (改为否定句)</p><p> [误] <span word="They">They</span> <span word="werent">werent</span> <span word="go">go</span> <span word="to">to</span> <span word="the">the</span> <span word="park">park</span> <span word="last">last</span> <span word="week">week</span>.</p><p> [正] <span word="They">They</span> <span word="didnt">didnt</span> <span word="go">go</span> <span word="to">to</span> <span word="the">the</span> <span word="park">park</span> <span word="last">last</span> <span word="week">week</span>.</p>
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