Unit 9 Can you come to my party语法情态动词课件 人教版八年级英语上册

Unit9每日一句——中考常用谚语积累

Allthingsaredifficultbeforetheyareeasy.万事开头难。情态动词情态动词是表示主语情感态度的动词，必须和动词原形一起使用构成谓语。

具有情态动词特征的词组： haveto必须 usedto过去常常… oughtto应该 hadbetter最好…原形过去式canmaywillshalldareneedmustcouldmightwouldshoulddared=should+V原形意义(辨析)情态动词can/could①表能力

Icanplaythepiano.

IcouldplaythepianowhenIwas12.

②表请求/邀请—Canyoucometomyparty?

—Couldyoucometomyparty?

—Yes,Ican./No,Ican’t. ③表推测Thered

hat

can’t

be

his,

because

his

is

green.Hewon’tdothis.Itcouldbewrong. can→现在的能力could→过去的能力can→语气生硬could→语气委婉礼貌could→不确定推测注意：回答用can，不再委婉！can’t→否定推测表能力表请求/邀请表推测can：现在的能力could：过去的能力can：语气生硬could：语气委婉礼貌回答用cancan’t：否定推测could：不确定推测情态动词may/might①may表请求

MayIsithere?

回答：

Yes,youcan. No,youcan’t.

②表推测Thatmay/mightbeMr.Green,Iamnotsure.

may→语气较委婉礼貌注意：回答用can，不再委婉！may/might→不确定推测may表请求语气委婉礼貌回答用can表推测may/might：不确定推测情态动词will/would①表将来

Iwillgotoseeamoviewithhimtomorrow.

Iwouldn’tgotoseeamoviewithhimlasttime.

②表请求/建议Willyougotoseeamoviewithme?

Wouldyougotoseeamoviewithme?

will→一般将来时would→过去将来时will→语气生硬would→语气委婉礼貌表将来表请求/建议will：一般将来时would：过去将来时will：语气生硬would：语气委婉礼貌情态动词shall/should①

should表责任义务(应该) Youshouldfinishyourhomeworkbeforehangingout.②

shall表征求意见(好不好)

Shallwegohomenow?Shalltheystart?shall表建议：好不好should表责任义务：应该情态动词must①肯定形式must：

表必须Youmustgohomerightnow.—MustIgohomerightnow?—No,youneedn’t/don’t

have

to

表肯定推测

ThegreenhatmustbelongtoMr.Green,Iamsure.②否定形式mustn’t：表禁止不准Youmustn’tgooutwithoutmypermission(允许).=can’t肯定形式must否定形式mustn’t表必须表肯定推测表禁止不准=can’t提问时否定回答needn’tdon’t

have

toneed①实意动词(肯定句)needtodosthIneedtogonow.②情态动词(否定句/疑问句)—MustIdoit?—No,youneedn’t.实意动词情态动词肯定句否定/疑问句needtodosth+V原形意义(辨析)表推测情态动词表推测肯定：must

肯定… 否定：can’t

不可能… 不定：might/may/could

可能…

Hemustbehomebecausethelightison.Thatcan’tbehimbecausehewenttoParis.Hemight/may/couldbeTom.Iamnotsur