Unit4ExploringliteratureGrammarandusage课件-高中英语译林版.pptx

;Howdoyouexplainmodalverbs?;情态动词;情态动词的常见特点：

;1.能力——能够做某事（具备某种能力）；

could主要指过去能够；

Twoeyescanseemorethanone.?

Couldthegirlreadbeforeshewenttoschool?

2.建议suggestion

youcangetideasfromdifferentsources…

Youcouldalsoreadbookreviewsinnewspapers,inmagazinesor

3.表possibility推测——意为“可能”，一般用于疑问句和否定句。

Asweallknow，anyonecanmakemistakes.

Thatcan’tbeKelly—she’sinNewYork.(“不可能是”)

;4.could表示更委婉语气，征求许可，回答时只能用can；用于否定句中表不允许。

CouldIhavealookatyournewpen??;2.may/might;haveto“必须、不得不“，强调客观需求，有时态的变化（hasto/hadto/willhaveto...)

否定形式为don‘t/doesn’t/didn‘thaveto...（没必要）

相当于needn’t

Wewillhavetothinkofanewplan.

Youdonthavetorun.;4.must;

3.在以must开头的疑问句中，肯定回答用must;

否定回答用needn’t或don’thaveto。

—Musthehandinhisexercisebooksnow?

—Yes,hemust./No,heneedn’t./No,hedon’thaveto.?;（1）shall:表征询意见或建议,多与I或we连用。

1)Whatshallwedothisweekend?

2)Whenshallmybrotherbeabletoleavehospital?

(2)常用于主语是第三人称的条约、法律法规、规章制度等文件中表“义务”或“规定”。

Everystudentshallwearschooluniformatschool.

;①表示建议、劝告≈oughtto；②也可表示推测

Youshouldgotoclassrightaway.

ThefilmYOLOshouldbegreatasitwasdirectedbyJialing.?

Youshouldbepolitetoyourteachers.?

Theyshouldbehomebynow.?

;Weoughttomakeacarefulplanbeforewestartthework.;6.willwould;用法;考点：表推测的情态动词

;2.对现在情况或客观事实的否定推测;练习:选用括号内合适的内容补全下面句子。

1.ImsorryIcouldntgetintouchwithhimbeforeheleft.I__________________(shouldhavephoned,havephoned)himearlier.

2.Sincetheyarentansweringtheirtelephone,they______________(canhaveleft,musthaveleft).

3.You____________(will,may)leadahorsetothewaterbutyou_________(dare,can)notmakeitdrink.

4.Mary_____________________(couldnthavereceived,neednthavereceived)myemail;otherwiseshewouldhaverepliedbeforenow.?

5.You