高中教学：2-非谓语动词-to do.pptx

;非谓语动词概述 1.什么是非谓语动词？ 非谓语动词是动词的特殊形式，在句子中可以充当谓语以外的成分。 2.非谓语动词在句子中的作用 一个句子中已存在一个主句(含谓语动词)，又没有连词的情况下，再出现一个动词则用非谓语动词。 eg.She got off the bus，but she left her handbag on the seat.(有并列连词，所以用谓语动词) She got off the bus，leaving her handbag on the seat.(没有连词，所以用非谓语动词) 3.非谓语动词的种类：动词的-ing形式、过去分词和不定式。;考点三　动词的不定式;Xiao Ming wants to play① cellphone games every day and his dream is to play② video games for three days and nights continuously.But he has so much homework to do③.In order to have④ a chance to play③ cellphone games，Xiao Ming decides to study① hard to get④a high score.He really hopes that his father will allow him to play⑤ cellphone games every day. To obtain⑥ such a chance is not easy.;动词的不定式形式在句子中作什么成分 ①作宾语 ②作表语 ③作定语 ④作状语 ⑤作宾补 ⑥作主语;一、不定式的形式;二、核心考点 1.不定式作主语 (1)不定式作主语时，可以直接放在句首，谓语动词常常用单数。 To enter a good university for further study is my goal now. 进入一所好大学深造是我现在的目标。 (2)不定式作主语时，更多放在谓语之后，用it作形式主语，常用于“It is/was＋adj.(＋for/of sb. )＋to do sth. ”结构中。 It’s rude to turn your back to your teacher and refuse to answer. 背对着老师，拒绝回答问题是不礼貌的。 It’s necessary for us to help those in need.我们有必要帮助那些有困难的人。;2.不定式作宾语 (1)不定式可在intend(打算)，plan(计划)，expect(期望)，pretend(假装)，would like/love/prefer(喜欢)，wish(希望)，decide(决定)，agree(同意)，help(帮助)，manage(设法)，persuade(说服)，refuse(拒绝)，seem/appear(好像)，promise(答应)，attempt(企图)，choose(选择)，ask(询问)，learn(学习)，tell(告诉)，fail(失败)，afford(付得起)等后作宾语。 The teacher decided to pretend to have known what the boys had done.He chose not to ask the boys but expected to be told everything. 老师决定假装已经知道这些男孩子们做了什么。他选择不去问孩子们，但是期望被告知一切。;(2)在某些动词如find，think，consider，feel，make，believe等后，常用it作形式宾语，而把真正的宾语不定式后置。 He feels/thinks it important to learn English well，but finds it difficult to remember the words. 他认为学好英语很重要，但是发现记单词很难。;3.不定式作表语 不定式作表语，主语往往是dream，goal，aim，purpose，plan等表示意向、打算、计划的词。 My dream is to become a doctor after my graduation from university. 我的梦想是大学毕业后当一名医生。 The aim of the talent show is to enrich students’ extra-curricular activities. 这次才艺秀的目的是丰富学生们的课外活动。;4.不定式作定语 (1)当被修饰词是序数词或被