英语九年级【知识精讲】9.非谓语动词(1)动词不定式 课件
展开动词不定式是由“不定式符号t+动词原形”构成的一种非谓语动词结构。(1)t不能省略。(2)t省略。
(1)t d放在句首作主语。T see is t believe. (2)多数用形式主语it,t d作真正的主语,为平衡句子结构,把真正的主语置于句后。it作形式主语的固定句型:1. It + be + 形容词+ fr sb.)+ 动词不定式 这类句型常用形容词easy, difficult, hard, 等作表语,如:It is very imprtant t learn English well. It’s necessary fr the yung t master tw freign language.
it作形式主语的固定句型: 2. It + be + 形容词 + f sb. + 动词不定式,这类形容词常是表示心理品质,性格特征的形容词,如:kind, nice clever, 等。如:It’s very kind f yu t help me with the wrk. 3. It + be +名词词组 + 动词不定式,如: It is nt a gd habit t stay up t late.
动词不定式作表语,常说明主语的内容、性质、特征。The best way is t jin an English club. My jb is t lk after patients.
(1)可以接带t的动词不定式作宾语的动词:动词+t d要求选择同意ask, chse, agree: He agreed t take part in the meeting.期望决定学习expect, hpe, decide, learn:I decide t study hard this term.宁可假装知道prefer, pretend, knw: He prefers t eat fruit fr dinner.希望想要愿意wish, want, wuld like/lve: I’d like t visit my grandpa this Sunday.
(2)t d作真正宾语,it作形式宾语动词feel, find, make, think等后面,可以用it作形式宾语代替真正的宾语——动词不定式,句子结构是:主语 + feel / find / make… + it + adj. / n. + t d...例:I find it difficult t remember everything.
(1)句子的主语或宾语是动词不定式的逻辑主语,不定式与其所修饰的名词、代词等存在逻辑的动宾关系。例1:I have many clthes t wash tday. (wash clthes)例2:I can’t think f any gd advice t give her. (give advice)例3:We have n huses t live in. (live in huses)
(2)动词不定式所修饰的名词是time, way, plan等时,不定式与这些名词呈现出动状关系或同位关系。例1:He needs time t d hmewrk.(动状关系) 例2:We have made a plan t learn frm Lei Feng.(同位关系)
(3)在“there be...”句型里,句子的主语是动词不定式动作的对象: 例1:There's just s much t see and d here. 例2:But there are still many things t d there.
宾语补足语,补充说明宾语。
(1)带t的动词不定式作宾语补足语:动词+sb./sth. t d要求允许提议ask, allw, advise:Lucy asked me t help with her hmewrk.期望邀请鼓励expect, invite, encurage:I invite her t have dinner at my huse. 教导告诉想要teach, tell, want:My teacher tld me t crss the rad carefully.等待希望愿意wish, wuld like / lve:I’d like Tny t cme t my birthday party.
(2)省略t的动词不定式作宾语补足语:动词+sb./sth. d主要运用于使役动词和感官类实义动词“注意”:ntice I nticed a little girl crss the rad quickly yesterday.一“感觉”:feel We all felt the huse shake.二“听”:hear, listen t I ften heard Tny sing in the next rm. 三“让”:have, let, make This picture makes me feel excited!四“看”:lk at, bserve, see, watch We saw Liu Yu play baseball last week.
(3)半帮助:help后接动词不定式作补语,t可带可不带。 例1:They can help yu t learn English. 例2:Using emails in English helps yu write quickly.
(1)目的状语,置于句首或句末,置于句首时常表示强调。 例1:In rder t catch the early bus, she gt up very early. 例2:A grup f yung peple gt tgether t discuss this questin. (2)原因状语,多见于“sb. + 系动词 + adj. + t d...”结构句。 例:I'm glad t see yu. (3)结果状语,多见于“”,“enugh t...”结构句中。例:She is t yung t g t schl.
特殊疑问词+动词不定式
疑问代词(wh, whm, what, which, whse)疑问副词(when, where, hw)当主语:When t hld the meeting has nt yet been decided.当宾语:We must knw what t say at the meeting.作表语:The questin was where t get the medicine needed.
动词不定式的被动语态和否定形式
1. 否定形式:带t的不定式否定形式为:nt / never t d...不带t的不定式的否定式为:nt / never d...例:They decide nt t talk t each ther. His parents tell him never t play sccer in the street.2. 被动语态形式:t be dne例:She didn’t like t be treated as a child. The clerk wuldn’t like t be laughed at by her custmers.
单项选择—What shuld I d, dctr?—_______healthy, yu shuld take mre exercise.A. KeepB. T keepC. KeepingD. T keep away frm
单项选择—I saw Betty _______ t Grandpa Li's hme just nw.—Yes. She’s ften seen _______ the ld man with the husewrk.A. g, helpB. ging, t helpC. g, t helpD. ging, helps
单项选择---I saw Betty _______ t Grandpa Li's hme just nw.---Yes. She’s ften seen _______the ld man with the husewrk.A. g, helpB. ging, t helpC. g, t helpD. ging, helps
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