精选优质文档-倾情为你奉上I. 动词原形的用法:1、除单三人称的一般现在时,其它人称作主语,动词用原形。2、将来时态shall, will, should, would之后用动词原形。3、祈使句句子开头用动词原形。4、助动词do, does, did之后用动词原形。5、情态动词can、could、may, might, have/has to, must, need, dare ,ought to之后用动词原形。6、使役动词let、 make、have 之后用动词原形。7、感官动词see、watch、notice、hear、 feel、find之后用动词原形(说明动作已经结束)。8、had better 之后用动词原形。9、why / why not 之后用动词原形。10、would rather do sth . than do sth .11. prefer to do sth. rather than do sth./ prefer doing sth. to doing sth.12.help sb. do sth.