英语语法祈使句知识点：学习祈使句应的五个要点
<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> 祈使句是表示请求、命令、劝告、祝愿或建议的句子。祈使句的主语一般为第二人称，但往往省去不用。同学们在学习祈使句时应注意以下几点：</p><p> 一、祈使句谓语用何动词形式</p><p> 英语祈使句的谓语总是用动词原形。如：</p><p> <span word="Be">Be</span> <span word="quiet">quiet</span>! 别说话!</p><p> <span word="Come">Come</span> <span word="earlier">earlier</span> <span word="next">next</span> <span word="time">time</span>. 下次早点来。</p><p> <span word="Have">Have</span> <span word="a">a</span> <span word="good">good</span> <span word="time">time</span>. 愿你玩得痛快。</p><p> <span word="Go">Go</span> <span word="and">and</span> <span word="tell">tell</span> <span word="her">her</span>. 去告诉她吧。</p><p> 注：有时为了加强语气，可在动词前加<span word="do">do</span>。如：</p><p> <span word="Do">Do</span> <span word="be">be</span> <span word="careful">careful</span>. 务请小心。</p><p> <span word="Do">Do</span> <span word="come">come</span> <span word="on">on</span> <span word="time">time</span>. 务必请准时来。</p><p> 二、肯定祈使句如何变成否定祈使句</p><p> 祈使句否定式的构成方法是在动词原形前加<span word="dont">dont</span>：</p><p> <span word="Dont">Dont</span> <span word="be">be</span> <span word="late">late</span>. 不要迟到。</p><p> <span word="Dont">Dont</span> <span word="speak">speak</span> <span word="so">so</span> <span word="loud">loud</span>. 别这么大声说话。</p><p> <span word="Dont">Dont</span> <span word="walk">walk</span> <span word="on">on</span> <span word="the">the</span> <span word="grass">grass</span>. 不要在草坪上走。</p><p> <span word="Dont">Dont</span> <span word="lose">lose</span> <span word="the">the</span> <span word="key">key</span>. 别把钥匙丢了。</p><p> <span word="Dont">Dont</span> <span word="come">come</span> <span word="unless">unless</span> <span word="I">I</span> <span word="telephone">telephone</span>. 除非我打电话，否则你别来。</p>
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