情态动词课件

情态动词表示推测不表示推测cancouldmaymightshallMusthavetowillwouldUsedtooughttoshoulddare(daren’t)need(needn’t)可兼做行为动词的情态动词：need，一情态动词的语法特征1）各个情态动词自身都有一定的词义，dare情态动词(+动词原形)行为动词needdare1无人称和数的变化;2尤其用于：*否定句及疑问句中;*在if之后;*或与hardly，数变化的影响，didhe?Hedaren’tspeakEnglishbeforesuchacrowd，darehe?NobodyneedtobeafraidofcatchingthediseaseNobodyneedbeafraidofcatchingthediseaseThesedishesneedbecleanedcarefullyThesedishesneedtobecleanedcarefullyThesedishesneedcleaningcarefully1Can与could的用法ACan二非推测情态动词的基本用法1)表能力can表能力时意味着凭体力或脑力或技术等可以无甚阻力地去做某事，即接动词原形，nobody连用;3常以needn’t和daren’t的形式出现;4dare有其过去时dared多用于肯定句;(sb)needtododaretodo(sth)needtobedone(sth)needdoingIdaresay…Idon’tdare(to)go判断正误:Howdareyousaysuchathing?Howdareyoutosaysuchathing?Hedaren’ttospeakEnglishbeforesuchacrowd，3）情态动词在句中不受任何人称，性，2）情态动词不能在句中独立担当谓语，noone，Icanclimbthispole我能爬这根杆子，4)情态动词后接的不定式（除ought外）都不带to，Heisonlyfour，never，buthe，