Unit 9 Can you come to my party語法情態(tài)動詞課件 人教版八年級英語上冊

Unit9每日一句——中考常用諺語積累

Allthingsaredifficultbeforetheyareeasy.萬事開頭難。情態(tài)動詞情態(tài)動詞是表示主語情感態(tài)度的動詞，必須和動詞原形一起使用構(gòu)成謂語。

具有情態(tài)動詞特征的詞組： haveto必須 usedto過去常常… oughtto應(yīng)該 hadbetter最好…原形過去式canmaywillshalldareneedmustcouldmightwouldshoulddared=should+V原形意義(辨析)情態(tài)動詞can/could①表能力

Icanplaythepiano.

IcouldplaythepianowhenIwas12.

②表請求/邀請—Canyoucometomyparty?

—Couldyoucometomyparty?

—Yes,Ican./No,Ican’t. ③表推測Thered

hat

can’t

be

his,

because

his

is

green.Hewon’tdothis.Itcouldbewrong. can→現(xiàn)在的能力could→過去的能力can→語氣生硬could→語氣委婉禮貌could→不確定推測注意：回答用can，不再委婉！can’t→否定推測表能力表請求/邀請表推測can：現(xiàn)在的能力could：過去的能力can：語氣生硬could：語氣委婉禮貌回答用cancan’t：否定推測could：不確定推測情態(tài)動詞may/might①may表請求

MayIsithere?

回答：

Yes,youcan. No,youcan’t.

②表推測Thatmay/mightbeMr.Green,Iamnotsure.

may→語氣較委婉禮貌注意：回答用can，不再委婉！may/might→不確定推測may表請求語氣委婉禮貌回答用can表推測may/might：不確定推測情態(tài)動詞will/would①表將來

Iwillgotoseeamoviewithhimtomorrow.

Iwouldn’tgotoseeamoviewithhimlasttime.

②表請求/建議Willyougotoseeamoviewithme?

Wouldyougotoseeamoviewithme?

will→一般將來時would→過去將來時will→語氣生硬would→語氣委婉禮貌表將來表請求/建議will：一般將來時would：過去將來時will：語氣生硬would：語氣委婉禮貌情態(tài)動詞shall/should①

should表責(zé)任義務(wù)(應(yīng)該) Youshouldfinishyourhomeworkbeforehangingout.②

shall表征求意見(好不好)

Shallwegohomenow?Shalltheystart?shall表建議：好不好should表責(zé)任義務(wù)：應(yīng)該情態(tài)動詞must①肯定形式must：

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

have

to

表肯定推測

ThegreenhatmustbelongtoMr.Green,Iamsure.②否定形式mustn’t：表禁止不準(zhǔn)Youmustn’tgooutwithoutmypermission(允許).=can’t肯定形式must否定形式mustn’t表必須表肯定推測表禁止不準(zhǔn)=can’t提問時否定回答needn’tdon’t

have

toneed①實意動詞(肯定句)needtodosthIneedtogonow.②情態(tài)動詞(否定句/疑問句)—MustIdoit?—No,youneedn’t.實意動詞情態(tài)動詞肯定句否定/疑問句needtodosth+V原形意義(辨析)表推測情態(tài)動詞表推測肯定：must

肯定… 否定：can’t

不可能… 不定：might/may/could

可能…

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